What is the Greatest Common Factor of 421 and 438?

Greatest common factor (GCF) of 421 and 438 is 1.

GCF(421,438) = 1

We will now calculate the prime factors of 421 and 438, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 421 and 438.

How to find the GCF of 421 and 438?

We will first find the prime factorization of 421 and 438. After we will calculate the factors of 421 and 438 and find the biggest common factor number .

Step-1: Prime Factorization of 421

Prime factors of 421 are 421. Prime factorization of 421 in exponential form is:

421 = 421¹

Step-2: Prime Factorization of 438

Prime factors of 438 are 2, 3, 73. Prime factorization of 438 in exponential form is:

438 = 2¹ × 3¹ × 73¹

Step-3: Factors of 421

List of positive integer factors of 421 that divides 421 without a remainder.

Step-4: Factors of 438

List of positive integer factors of 438 that divides 421 without a remainder.

1, 2, 3, 6, 73, 146, 219

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 421 and 438. The biggest common factor number is the GCF number.
So the greatest common factor 421 and 438 is 1.

Also check out the Least Common Multiple of 421 and 438