What is the Greatest Common Factor of 1989 and 1993?

Greatest common factor (GCF) of 1989 and 1993 is 1.

GCF(1989,1993) = 1

We will now calculate the prime factors of 1989 and 1993, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1989 and 1993.

How to find the GCF of 1989 and 1993?

We will first find the prime factorization of 1989 and 1993. After we will calculate the factors of 1989 and 1993 and find the biggest common factor number .

Step-1: Prime Factorization of 1989

Prime factors of 1989 are 3, 13, 17. Prime factorization of 1989 in exponential form is:

1989 = 3² × 13¹ × 17¹

Step-2: Prime Factorization of 1993

Prime factors of 1993 are 1993. Prime factorization of 1993 in exponential form is:

1993 = 1993¹

Step-3: Factors of 1989

List of positive integer factors of 1989 that divides 1989 without a remainder.

1, 3, 9, 13, 17, 39, 51, 117, 153, 221, 663

Step-4: Factors of 1993

List of positive integer factors of 1993 that divides 1989 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1989 and 1993. The biggest common factor number is the GCF number.
So the greatest common factor 1989 and 1993 is 1.

Also check out the Least Common Multiple of 1989 and 1993