What is the Greatest Common Factor of 39991 and 40009?

Greatest common factor (GCF) of 39991 and 40009 is 1.

GCF(39991,40009) = 1

We will now calculate the prime factors of 39991 and 40009, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39991 and 40009.

How to find the GCF of 39991 and 40009?

We will first find the prime factorization of 39991 and 40009. After we will calculate the factors of 39991 and 40009 and find the biggest common factor number .

Step-1: Prime Factorization of 39991

Prime factors of 39991 are 7, 29, 197. Prime factorization of 39991 in exponential form is:

39991 = 7¹ × 29¹ × 197¹

Step-2: Prime Factorization of 40009

Prime factors of 40009 are 40009. Prime factorization of 40009 in exponential form is:

40009 = 40009¹

Step-3: Factors of 39991

List of positive integer factors of 39991 that divides 39991 without a remainder.

1, 7, 29, 197, 203, 1379, 5713

Step-4: Factors of 40009

List of positive integer factors of 40009 that divides 39991 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39991 and 40009. The biggest common factor number is the GCF number.
So the greatest common factor 39991 and 40009 is 1.

Also check out the Least Common Multiple of 39991 and 40009