What is the Greatest Common Factor of 39855 and 39861?

Greatest common factor (GCF) of 39855 and 39861 is 3.

GCF(39855,39861) = 3

We will now calculate the prime factors of 39855 and 39861, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39855 and 39861.

How to find the GCF of 39855 and 39861?

We will first find the prime factorization of 39855 and 39861. After we will calculate the factors of 39855 and 39861 and find the biggest common factor number .

Step-1: Prime Factorization of 39855

Prime factors of 39855 are 3, 5, 2657. Prime factorization of 39855 in exponential form is:

39855 = 3¹ × 5¹ × 2657¹

Step-2: Prime Factorization of 39861

Prime factors of 39861 are 3, 43, 103. Prime factorization of 39861 in exponential form is:

39861 = 3² × 43¹ × 103¹

Step-3: Factors of 39855

List of positive integer factors of 39855 that divides 39855 without a remainder.

1, 3, 5, 15, 2657, 7971, 13285

Step-4: Factors of 39861

List of positive integer factors of 39861 that divides 39855 without a remainder.

1, 3, 9, 43, 103, 129, 309, 387, 927, 4429, 13287

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39855 and 39861. The biggest common factor number is the GCF number.
So the greatest common factor 39855 and 39861 is 3.

Also check out the Least Common Multiple of 39855 and 39861