Greatest Common Factor of 391 and 399

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 391, 399 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 391 and 399 is 1.

GCF(391,399) = 1

GCF of 391 and 399

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 391 and 399

GCF of 391 and 399 is 1

Prime Factorization of 391


17 391
23 23
1

Prime factors of 391 are 17,23. Prime factorization of 391 in exponential form is:

391 = 171×231

Prime Factorization of 399


3 399
7 133
19 19
1

Prime factors of 399 are 3,7,19. Prime factorization of 399 in exponential form is:

399 = 31×71×191

∴ So by taking common prime factors GCF of 391 and 399 is 1

Greatest Common Factor of 391 and 399 by matching factors method

Factors of 391

List of positive integer factors of 391 that divides 391 without a remainder.

1,17,23,391

Factors of 399

List of positive integer factors of 399 that divides 399 without a remainder.

1,3,7,19,21,57,133,399

Greatest Common Factor

We found the factors and prime factorization of 391 and 399. The biggest common factor number is the GCF number.
So the greatest common factor 391 and 399 is 1.

Also check out the Least Common Multiple of 391 and 399

Properties of GCF 391 and 399

(i) The GCF of 391 and 399 is associative

GCF of 391 and 399 = GCF of 399 and 391

Related Greatest Common Factor of 391

Related Greatest Common Factor of 399

Frequently Asked Questions on GCF of 391 and 399

1. What is the GCF of 391 and 399?

Answer: GCF of 391 and 399 is 1.

2. What are the Factors of 391?

Answer: Factors of 391 are 1, 17, 23, 391. There are 4 integers that are factors of 391. The greatest factor of 391 is 391.

3. What are the Factors of 399?

Answer: Factors of 399 are 1, 3, 7, 19, 21, 57, 133, 399. There are 8 integers that are factors of 399. The greatest factor of 399 is 399.

4. How to Find the GCF of 391 and 399?

Answer:

Greatest Common Factor of 391 and 399 = 1

Step 1: Find the prime factorization of 391

391 = 17 x 23

Step 2: Find the prime factorization of 399

399 = 3 x 7 x 19

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = = 1

Step 4: Therefore, the greatest common factor of 391 and 399 is 1