What is the Least Common Multiple of 39991 and 40003?

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 39991 and 40003 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 39991 and 40003, than apply into the LCM equation.

GCF(39991,40003) = 1
LCM(39991,40003) = ( 39991 × 40003) / 1
LCM(39991,40003) = 1599759973 / 1
LCM(39991,40003) = 1599759973

Least Common Multiple (LCM) of 39991 and 40003 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 39991 and 40003. First we will calculate the prime factors of 39991 and 40003.

Prime Factorization of 39991

Prime Factorization of 40003

Now multiplying the highest exponent prime factors to calculate the LCM of 39991 and 40003.

LCM(39991,40003) = 7¹ × 29¹ × 197¹ × 109¹ × 367¹
LCM(39991,40003) = 1599759973