What is the Least Common Multiple of 42405 and 42415?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 42405 and 42415 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 42405 and 42415, than apply into the LCM equation.

GCF(42405,42415) = 5
LCM(42405,42415) = ( 42405 × 42415) / 5
LCM(42405,42415) = 1798608075 / 5
LCM(42405,42415) = 359721615

Least Common Multiple (LCM) of 42405 and 42415 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 42405 and 42415. First we will calculate the prime factors of 42405 and 42415.

Prime Factorization of 42405

Prime Factorization of 42415

Now multiplying the highest exponent prime factors to calculate the LCM of 42405 and 42415.

LCM(42405,42415) = 3¹ × 5¹ × 11¹ × 257¹ × 17¹ × 499¹
LCM(42405,42415) = 359721615