What is the Least Common Multiple of 398 and 407?

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 398 and 407 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 398 and 407, than apply into the LCM equation.

GCF(398,407) = 1
LCM(398,407) = ( 398 × 407) / 1
LCM(398,407) = 161986 / 1
LCM(398,407) = 161986

Least Common Multiple (LCM) of 398 and 407 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 398 and 407. First we will calculate the prime factors of 398 and 407.

Prime Factorization of 398

Prime Factorization of 407

Now multiplying the highest exponent prime factors to calculate the LCM of 398 and 407.

LCM(398,407) = 2¹ × 199¹ × 11¹ × 37¹
LCM(398,407) = 161986