What is the Greatest Common Factor of 7821 and 7839?

Greatest common factor (GCF) of 7821 and 7839 is 9.

GCF(7821,7839) = 9

We will now calculate the prime factors of 7821 and 7839, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7821 and 7839.

How to find the GCF of 7821 and 7839?

We will first find the prime factorization of 7821 and 7839. After we will calculate the factors of 7821 and 7839 and find the biggest common factor number .

Step-1: Prime Factorization of 7821

Prime factors of 7821 are 3, 11, 79. Prime factorization of 7821 in exponential form is:

7821 = 3² × 11¹ × 79¹

Step-2: Prime Factorization of 7839

Prime factors of 7839 are 3, 13, 67. Prime factorization of 7839 in exponential form is:

7839 = 3² × 13¹ × 67¹

Step-3: Factors of 7821

List of positive integer factors of 7821 that divides 7821 without a remainder.

1, 3, 9, 11, 33, 79, 99, 237, 711, 869, 2607

Step-4: Factors of 7839

List of positive integer factors of 7839 that divides 7821 without a remainder.

1, 3, 9, 13, 39, 67, 117, 201, 603, 871, 2613

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7821 and 7839. The biggest common factor number is the GCF number.
So the greatest common factor 7821 and 7839 is 9.

Also check out the Least Common Multiple of 7821 and 7839