What is the Greatest Common Factor of 3971 and 3990?

Greatest common factor (GCF) of 3971 and 3990 is 19.

GCF(3971,3990) = 19

We will now calculate the prime factors of 3971 and 3990, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 3971 and 3990.

How to find the GCF of 3971 and 3990?

We will first find the prime factorization of 3971 and 3990. After we will calculate the factors of 3971 and 3990 and find the biggest common factor number .

Step-1: Prime Factorization of 3971

Prime factors of 3971 are 11, 19. Prime factorization of 3971 in exponential form is:

3971 = 11¹ × 19²

Step-2: Prime Factorization of 3990

Prime factors of 3990 are 2, 3, 5, 7, 19. Prime factorization of 3990 in exponential form is:

3990 = 2¹ × 3¹ × 5¹ × 7¹ × 19¹

Step-3: Factors of 3971

List of positive integer factors of 3971 that divides 3971 without a remainder.

1, 11, 19, 209, 361

Step-4: Factors of 3990

List of positive integer factors of 3990 that divides 3971 without a remainder.

1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 3971 and 3990. The biggest common factor number is the GCF number.
So the greatest common factor 3971 and 3990 is 19.

Also check out the Least Common Multiple of 3971 and 3990