What is the Least Common Multiple of 18405 and 18409?

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 18405 and 18409 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 18405 and 18409, than apply into the LCM equation.

GCF(18405,18409) = 1
LCM(18405,18409) = ( 18405 × 18409) / 1
LCM(18405,18409) = 338817645 / 1
LCM(18405,18409) = 338817645

Least Common Multiple (LCM) of 18405 and 18409 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 18405 and 18409. First we will calculate the prime factors of 18405 and 18409.

Prime Factorization of 18405

Prime Factorization of 18409

Now multiplying the highest exponent prime factors to calculate the LCM of 18405 and 18409.

LCM(18405,18409) = 3² × 5¹ × 409¹ × 41¹ × 449¹
LCM(18405,18409) = 338817645