What is the Greatest Common Factor of 39990 and 40009?

Greatest common factor (GCF) of 39990 and 40009 is 1.

GCF(39990,40009) = 1

We will now calculate the prime factors of 39990 and 40009, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39990 and 40009.

How to find the GCF of 39990 and 40009?

We will first find the prime factorization of 39990 and 40009. After we will calculate the factors of 39990 and 40009 and find the biggest common factor number .

Step-1: Prime Factorization of 39990

Prime factors of 39990 are 2, 3, 5, 31, 43. Prime factorization of 39990 in exponential form is:

39990 = 2¹ × 3¹ × 5¹ × 31¹ × 43¹

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 39990

List of positive integer factors of 39990 that divides 39990 without a remainder.

1, 2, 3, 5, 6, 10, 15, 30, 31, 43, 62, 86, 93, 129, 155, 186, 215, 258, 310, 430, 465, 645, 930, 1290, 1333, 2666, 3999, 6665, 7998, 13330, 19995

Step-4: Factors of 40009

List of positive integer factors of 40009 that divides 39990 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39990 and 40009. The biggest common factor number is the GCF number.
So the greatest common factor 39990 and 40009 is 1.

Also check out the Least Common Multiple of 39990 and 40009