What is the Greatest Common Factor of 1239 and 1253?

Greatest common factor (GCF) of 1239 and 1253 is 7.

GCF(1239,1253) = 7

We will now calculate the prime factors of 1239 and 1253, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1239 and 1253.

How to find the GCF of 1239 and 1253?

We will first find the prime factorization of 1239 and 1253. After we will calculate the factors of 1239 and 1253 and find the biggest common factor number .

Step-1: Prime Factorization of 1239

Prime factors of 1239 are 3, 7, 59. Prime factorization of 1239 in exponential form is:

1239 = 3¹ × 7¹ × 59¹

Step-2: Prime Factorization of 1253

Prime factors of 1253 are 7, 179. Prime factorization of 1253 in exponential form is:

1253 = 7¹ × 179¹

Step-3: Factors of 1239

List of positive integer factors of 1239 that divides 1239 without a remainder.

1, 3, 7, 21, 59, 177, 413

Step-4: Factors of 1253

List of positive integer factors of 1253 that divides 1239 without a remainder.

1, 7, 179

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1239 and 1253. The biggest common factor number is the GCF number.
So the greatest common factor 1239 and 1253 is 7.

Also check out the Least Common Multiple of 1239 and 1253