What is the Greatest Common Factor of 378 and 391?

Greatest common factor (GCF) of 378 and 391 is 1.

GCF(378,391) = 1

We will now calculate the prime factors of 378 and 391, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 378 and 391.

How to find the GCF of 378 and 391?

We will first find the prime factorization of 378 and 391. After we will calculate the factors of 378 and 391 and find the biggest common factor number .

Step-1: Prime Factorization of 378

Prime factors of 378 are 2, 3, 7. Prime factorization of 378 in exponential form is:

378 = 2¹ × 3³ × 7¹

Step-2: Prime Factorization of 391

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

391 = 17¹ × 23¹

Step-3: Factors of 378

List of positive integer factors of 378 that divides 378 without a remainder.

1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189

Step-4: Factors of 391

List of positive integer factors of 391 that divides 378 without a remainder.

1, 17, 23

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 378 and 391. The biggest common factor number is the GCF number.
So the greatest common factor 378 and 391 is 1.

Also check out the Least Common Multiple of 378 and 391