What is the Greatest Common Factor of 840 and 859?

Greatest common factor (GCF) of 840 and 859 is 1.

GCF(840,859) = 1

We will now calculate the prime factors of 840 and 859, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 840 and 859.

How to find the GCF of 840 and 859?

We will first find the prime factorization of 840 and 859. After we will calculate the factors of 840 and 859 and find the biggest common factor number .

Step-1: Prime Factorization of 840

Prime factors of 840 are 2, 3, 5, 7. Prime factorization of 840 in exponential form is:

840 = 2³ × 3¹ × 5¹ × 7¹

Step-2: Prime Factorization of 859

Prime factors of 859 are 859. Prime factorization of 859 in exponential form is:

859 = 859¹

Step-3: Factors of 840

List of positive integer factors of 840 that divides 840 without a remainder.

1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420

Step-4: Factors of 859

List of positive integer factors of 859 that divides 840 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 840 and 859. The biggest common factor number is the GCF number.
So the greatest common factor 840 and 859 is 1.

Also check out the Least Common Multiple of 840 and 859