What is the Least Common Multiple of 4001 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 4001 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 4001 and 4009, than apply into the LCM equation.

GCF(4001,4009) = 1
LCM(4001,4009) = ( 4001 × 4009) / 1
LCM(4001,4009) = 16040009 / 1
LCM(4001,4009) = 16040009

Least Common Multiple (LCM) of 4001 and 4009 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 4001 and 4009. First we will calculate the prime factors of 4001 and 4009.

Prime Factorization of 4001

Prime Factorization of 4009

Now multiplying the highest exponent prime factors to calculate the LCM of 4001 and 4009.

LCM(4001,4009) = 4001¹ × 19¹ × 211¹
LCM(4001,4009) = 16040009