What is the Least Common Multiple of 3990 and 4009?

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 3990 and 4009 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3990 and 4009, than apply into the LCM equation.

GCF(3990,4009) = 19
LCM(3990,4009) = ( 3990 × 4009) / 19
LCM(3990,4009) = 15995910 / 19
LCM(3990,4009) = 841890

Least Common Multiple (LCM) of 3990 and 4009 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3990 and 4009. First we will calculate the prime factors of 3990 and 4009.

Prime Factorization of 3990

Prime Factorization of 4009

Now multiplying the highest exponent prime factors to calculate the LCM of 3990 and 4009.

LCM(3990,4009) = 2¹ × 3¹ × 5¹ × 7¹ × 19¹ × 211¹
LCM(3990,4009) = 841890