What is the Greatest Common Factor of 12840 and 12857?

Greatest common factor (GCF) of 12840 and 12857 is 1.

GCF(12840,12857) = 1

We will now calculate the prime factors of 12840 and 12857, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12840 and 12857.

How to find the GCF of 12840 and 12857?

We will first find the prime factorization of 12840 and 12857. After we will calculate the factors of 12840 and 12857 and find the biggest common factor number .

Step-1: Prime Factorization of 12840

Prime factors of 12840 are 2, 3, 5, 107. Prime factorization of 12840 in exponential form is:

12840 = 2³ × 3¹ × 5¹ × 107¹

Step-2: Prime Factorization of 12857

Prime factors of 12857 are 13, 23, 43. Prime factorization of 12857 in exponential form is:

12857 = 13¹ × 23¹ × 43¹

Step-3: Factors of 12840

List of positive integer factors of 12840 that divides 12840 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 107, 120, 214, 321, 428, 535, 642, 856, 1070, 1284, 1605, 2140, 2568, 3210, 4280, 6420

Step-4: Factors of 12857

List of positive integer factors of 12857 that divides 12840 without a remainder.

1, 13, 23, 43, 299, 559, 989

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12840 and 12857. The biggest common factor number is the GCF number.
So the greatest common factor 12840 and 12857 is 1.

Also check out the Least Common Multiple of 12840 and 12857