# Prime Factors of 399

Prime Factors of 399 are 3, 7, and 19

#### How to find prime factors of a number

 1.   Prime Factorization of 399 by Division Method 2.   Prime Factorization of 399 by Factor Tree Method 3.   Definition of Prime Factors 4.   Frequently Asked Questions

#### Steps to find Prime Factors of 399 by Division Method

To find the primefactors of 399 using the division method, follow these steps:

• Step 1. Start dividing 399 by the smallest prime number, i.e., 2, 3, 5, and so on. Find the smallest prime factor of the number.
• Step 2. After finding the smallest prime factor of the number 399, which is 3. Divide 399 by 3 to obtain the quotient (133).
399 ÷ 3 = 133
• Step 3. Repeat step 1 with the obtained quotient (133).
133 ÷ 7 = 19
19 ÷ 19 = 1

So, the prime factorization of 399 is, 399 = 3 x 7 x 19.

#### Steps to find Prime Factors of 399 by Factor Tree Method

We can follow the same procedure using the factor tree of 399 as shown below:

So, the prime factorization of 399 is, 399 = 3 x 7 x 19.

#### What does Prime factor of a number mean?

A prime number in mathematics is defined as any natural number greater than 1, that is not divisible by any number except 1 and the number itself. When we express any number as the product of these prime numbers than these prime numbers become prime factors of that number. Eg- Prime Factors of 399 are 3 x 7 x 19.

#### Properties of Prime Factors

• For any given number there is one and only one set of unique prime factors.
• 2 is the only even prime number. So, any given number can have only one even prime factor and that is 2.
• Two prime factors of a given number are always coprime to each other.
• 1 is neither a prime number nor a composite number and also 1 is the factor of every given number. So, 1 is the factor of 399 but not a prime factor of 399.

#### Frequently Asked Questions

• Which is the smallest prime factor of 399?

Smallest prime factor of 399 is 3.

• What are the factors of 399?

Factors of 399 are 1 , 3 , 7 , 19 , 21 , 57 , 133 , 399.

• What is prime factorization of 399 in exponential form?

Prime factorization of 399 in exponential form is 3 x 7 x 19.

• Is 399 a prime number or a composite number?

399 is a composite number.

• Is 399 a prime number?

false, 399 is not a prime number.

• What is the sum of all prime factors of 399?

Prime factors of 399 are 3 x 7 x 19. Therefore, their sum is 29.

• What is the product of all prime factors of 399?

Prime factors of 399 are 3 x 7 x 19. Therefore, their product is 399.

• What numbers are the prime factors of 399?

Prime factors of 399 are 3 , 7 , 19.

• What is the sum of all odd prime factors of 399?

Prime factors of 399 are 3 , 7 , 19, out of which 3 , 7 , 19 are odd numbers. So, the sum of odd prime factors of 399 is 3 + 7 + 19 = 29.

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