What is the Greatest Common Factor of 1405 and 1421?

Greatest common factor (GCF) of 1405 and 1421 is 1.

GCF(1405,1421) = 1

We will now calculate the prime factors of 1405 and 1421, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1405 and 1421.

How to find the GCF of 1405 and 1421?

We will first find the prime factorization of 1405 and 1421. After we will calculate the factors of 1405 and 1421 and find the biggest common factor number .

Step-1: Prime Factorization of 1405

Prime factors of 1405 are 5, 281. Prime factorization of 1405 in exponential form is:

1405 = 5¹ × 281¹

Step-2: Prime Factorization of 1421

Prime factors of 1421 are 7, 29. Prime factorization of 1421 in exponential form is:

1421 = 7² × 29¹

Step-3: Factors of 1405

List of positive integer factors of 1405 that divides 1405 without a remainder.

1, 5, 281

Step-4: Factors of 1421

List of positive integer factors of 1421 that divides 1405 without a remainder.

1, 7, 29, 49, 203

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1405 and 1421. The biggest common factor number is the GCF number.
So the greatest common factor 1405 and 1421 is 1.

Also check out the Least Common Multiple of 1405 and 1421