Greatest Common Factor of 390 and 391

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 390, 391 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 390 and 391 is 1.

GCF(390,391) = 1

GCF of 390 and 391

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

GCF of:
and

Greatest Common Factor of 390 and 391

GCF of 390 and 391 is 1

Prime Factorization of 390


2 390
3 195
5 65
13 13
1

Prime factors of 390 are 2,3,5,13. Prime factorization of 390 in exponential form is:

390 = 21×31×51×131

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

∴ So by taking common prime factors GCF of 390 and 391 is 1

Greatest Common Factor of 390 and 391 by matching factors method

Factors of 390

List of positive integer factors of 390 that divides 390 without a remainder.

1,2,3,5,6,10,13,15,26,30,39,65,78,130,195,390

Factors of 391

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

1,17,23,391

Greatest Common Factor

We found the factors and prime factorization of 390 and 391. The biggest common factor number is the GCF number.
So the greatest common factor 390 and 391 is 1.

Also check out the Least Common Multiple of 390 and 391

Properties of GCF 390 and 391

(i) The GCF of 390 and 391 is associative

GCF of 390 and 391 = GCF of 391 and 390

Related Greatest Common Factor of 390

Related Greatest Common Factor of 391

Frequently Asked Questions on GCF of 390 and 391

1. What is the GCF of 390 and 391?

Answer: GCF of 390 and 391 is 1.

2. What are the Factors of 390?

Answer: Factors of 390 are 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390. There are 16 integers that are factors of 390. The greatest factor of 390 is 390.

3. 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.

4. How to Find the GCF of 390 and 391?

Answer:

Greatest Common Factor of 390 and 391 = 1

Step 1: Find the prime factorization of 390

390 = 2 x 3 x 5 x 13

Step 2: Find the prime factorization of 391

391 = 17 x 23

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 390 and 391 is 1