What is the Greatest Common Factor of 3965 and 3978?

Greatest common factor (GCF) of 3965 and 3978 is 13.

GCF(3965,3978) = 13

We will now calculate the prime factors of 3965 and 3978, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 3965 and 3978.

How to find the GCF of 3965 and 3978?

We will first find the prime factorization of 3965 and 3978. After we will calculate the factors of 3965 and 3978 and find the biggest common factor number .

Step-1: Prime Factorization of 3965

Prime factors of 3965 are 5, 13, 61. Prime factorization of 3965 in exponential form is:

3965 = 5¹ × 13¹ × 61¹

Step-2: Prime Factorization of 3978

Prime factors of 3978 are 2, 3, 13, 17. Prime factorization of 3978 in exponential form is:

3978 = 2¹ × 3² × 13¹ × 17¹

Step-3: Factors of 3965

List of positive integer factors of 3965 that divides 3965 without a remainder.

1, 5, 13, 61, 65, 305, 793

Step-4: Factors of 3978

List of positive integer factors of 3978 that divides 3965 without a remainder.

1, 2, 3, 6, 9, 13, 17, 18, 26, 34, 39, 51, 78, 102, 117, 153, 221, 234, 306, 442, 663, 1326, 1989

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 3965 and 3978. The biggest common factor number is the GCF number.
So the greatest common factor 3965 and 3978 is 13.

Also check out the Least Common Multiple of 3965 and 3978