What is the Greatest Common Factor of 8421 and 8439?

Greatest common factor (GCF) of 8421 and 8439 is 3.

GCF(8421,8439) = 3

We will now calculate the prime factors of 8421 and 8439, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 8421 and 8439.

How to find the GCF of 8421 and 8439?

We will first find the prime factorization of 8421 and 8439. After we will calculate the factors of 8421 and 8439 and find the biggest common factor number .

Step-1: Prime Factorization of 8421

Prime factors of 8421 are 3, 7, 401. Prime factorization of 8421 in exponential form is:

8421 = 3¹ × 7¹ × 401¹

Step-2: Prime Factorization of 8439

Prime factors of 8439 are 3, 29, 97. Prime factorization of 8439 in exponential form is:

8439 = 3¹ × 29¹ × 97¹

Step-3: Factors of 8421

List of positive integer factors of 8421 that divides 8421 without a remainder.

1, 3, 7, 21, 401, 1203, 2807

Step-4: Factors of 8439

List of positive integer factors of 8439 that divides 8421 without a remainder.

1, 3, 29, 87, 97, 291, 2813

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 8421 and 8439. The biggest common factor number is the GCF number.
So the greatest common factor 8421 and 8439 is 3.

Also check out the Least Common Multiple of 8421 and 8439