 # Factors of 387: Prime Factorization, Methods, and Examples

There are six factors of the number 387 which means that 386 is completely divisible by these six numbers. As the number of factors of 386 is more than 2 so it is a composite number. By definition composite number is an integer that has one complete divisor other than 1 or the number itself.

### Factors of 387

Here are the factors of number 387.

Factors of 387: 1, 3, 9, 43, 129, 387

### Negative Factors of 387

The negative factors of 387 are similar to its positive aspects, just with a negative sign.

Negative Factors of 387: -1, -3, -9, -43, -129, -387

### Prime Factorization of 387

The prime factorization of 387 is the way of expressing its prime factors in the product form.

Prime Factorization: 3$^2$ x 43

In this article, we will learn about the factors of 387 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

## What Are the Factors of 387?

The factors of 387 are 1, 3, 9, 43, 129, and 387. These numbers are the factors as they do not leave any remainder when divided by 387.

The factors of 387 are classified as prime numbers and composite numbers. The prime factors of the number 387  can be determined using the prime factorization technique.

## How To Find the Factors of 87?

You can find the factors of 387 by using the rules of divisibility. The divisibility rule states that any number, when divided by any other natural number, is said to be divisible by the number if the quotient is the whole number and the resulting remainder is zero.

To find the factors of 387, create a list containing the numbers that are exactly divisible by 387 with zero remainders. One important thing to note is that 1 and 387 are the 387’s factors as every natural number has 1 and the number itself as its factor.

1 is also called the universal factor of every number. The factors of 387 are determined as follows:

$\dfrac{387}{1} = 387$

$\dfrac{387}{3} = 129$

$\dfrac{387}{9} = 43$

$\dfrac{387}{387} = 1$

Therefore,1, 3, 9, 43, 129, and 387  are the factors of 387.

### Total Number of Factors of 387

For 387, there are 6 positive factors and 6 negative ones. So in total, there are 12 factors of 387.

To find the total number of factors of the given number, follow the procedure mentioned below:

1. Find the factorization/prime factorization of the given number.
2. Demonstrate the prime factorization of the number in the form of exponent form.
3. Add 1 to each of the exponents of the prime factor.
4. Now, multiply the resulting exponents together. This obtained product is equivalent to the total number of factors of the given number.

By following this procedure, the total number of factors of 387 is given as:

Factorization of 387 is 1 x 3 x 3 x 43

The exponent of 3 is 2 and the exponent of 43 and 1 is 2.

Adding 1 to each and multiplying them together results in 12.

Therefore, the total number of factors of 387 is 12. 6 are positive, and 6 factors are negative.

### Important Notes

Here are some essential points that must be considered while finding the factors of any given number:

• The factor of any given number must be a whole number.
• The factors of the number cannot be in the form of decimals or fractions.
• Factors can be positive as well as negative.
• Negative factors are the additive inverse of the positive factors of a given number.
• The factor of a number cannot be greater than that number.
• Every even number has 2 as its prime factor, the smallest prime factor.

## Factors of 387 by Prime Factorization

The number 387 is a composite number. Prime factorization is a valuable technique for finding the number’s prime factors and expressing the number as the product of its prime factors. Before finding the factors of 387 using prime factorization, let us find out what prime factors are. Prime factors are the factors of any given number that are only divisible by 1 and themselves.

To start the prime factorization of 387, start dividing by its most minor prime factor. First, determine that the given number is either even or odd. If it is an even number, then 2 will be the smallest prime factor.

Continue splitting the quotient obtained until 1 is received as the quotient. The prime factorization of 387 can be expressed as:

387 = 3 x 3 x 43

## Factors of 387 in Pairs

The factor pairs are the duplet of numbers that, when multiplied together, result in the factorized number. Factor pairs can be more than one depending on the total number of factors given. For 387, the factor pairs can be found as:

1 x 387 = 387

3 x 129 = 387

9 x 43 = 387

The possible factor pairs of 387 are given as (1, 387), (3, 129), and (9, 43 ).

All these numbers in pairs, when multiplied, give 387 as the product.

The negative factor pairs of 387 are given as:

-1 x -387 = 387

-3 x -129 = 387

-9 x -43 = 387

It is important to note that in negative factor pairs, the minus sign has been multiplied by the minus sign, due to which the resulting product is the original positive number. Therefore, -1, -3, -9, -43, -129 and -387 are called negative factors of 387.

The list of all the factors of 387, including positive as well as negative numbers, is given below.

Factor list of 387: 1, -1, 3, -3, 9, -9, 43, -43, 129, -129, 387 and -387

## Factors of 387 Solved Examples

To better understand the concept of factors, let’s solve some examples.

### Example 1

How many factors of 387 are there?

### Solution

The total number of Factors of X is 6.

Factors of 387 are 1, 3, 9, 43, 129 and 387

### Example 2

Find the factors of 387 using prime factorization.

### Solution

The prime factorization of 387 is given as:

387 $\div$ 3 = 129

129 $\div$ 3 = 43

43 $\div$ 43 = 1

So the prime factorization of 387 can be written as:

3 x 3 x  43 = 387