What is the Greatest Common Factor of 3945 and 3951?

Greatest common factor (GCF) of 3945 and 3951 is 3.

GCF(3945,3951) = 3

We will now calculate the prime factors of 3945 and 3951, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 3945 and 3951.

How to find the GCF of 3945 and 3951?

We will first find the prime factorization of 3945 and 3951. After we will calculate the factors of 3945 and 3951 and find the biggest common factor number .

Step-1: Prime Factorization of 3945

Prime factors of 3945 are 3, 5, 263. Prime factorization of 3945 in exponential form is:

3945 = 3¹ × 5¹ × 263¹

Step-2: Prime Factorization of 3951

Prime factors of 3951 are 3, 439. Prime factorization of 3951 in exponential form is:

3951 = 3² × 439¹

Step-3: Factors of 3945

List of positive integer factors of 3945 that divides 3945 without a remainder.

1, 3, 5, 15, 263, 789, 1315

Step-4: Factors of 3951

List of positive integer factors of 3951 that divides 3945 without a remainder.

1, 3, 9, 439, 1317

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 3945 and 3951. The biggest common factor number is the GCF number.
So the greatest common factor 3945 and 3951 is 3.

Also check out the Least Common Multiple of 3945 and 3951