What is the Greatest Common Factor of 42138 and 42156?

Greatest common factor (GCF) of 42138 and 42156 is 18.

GCF(42138,42156) = 18

We will now calculate the prime factors of 42138 and 42156, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 42138 and 42156.

How to find the GCF of 42138 and 42156?

We will first find the prime factorization of 42138 and 42156. After we will calculate the factors of 42138 and 42156 and find the biggest common factor number .

Step-1: Prime Factorization of 42138

Prime factors of 42138 are 2, 3, 2341. Prime factorization of 42138 in exponential form is:

42138 = 2¹ × 3² × 2341¹

Step-2: Prime Factorization of 42156

Prime factors of 42156 are 2, 3, 1171. Prime factorization of 42156 in exponential form is:

42156 = 2² × 3² × 1171¹

Step-3: Factors of 42138

List of positive integer factors of 42138 that divides 42138 without a remainder.

1, 2, 3, 6, 9, 18, 2341, 4682, 7023, 14046, 21069

Step-4: Factors of 42156

List of positive integer factors of 42156 that divides 42138 without a remainder.

1, 2, 3, 4, 6, 9, 12, 18, 36, 1171, 2342, 3513, 4684, 7026, 10539, 14052, 21078

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 42138 and 42156. The biggest common factor number is the GCF number.
So the greatest common factor 42138 and 42156 is 18.

Also check out the Least Common Multiple of 42138 and 42156