What is the Least Common Multiple of 39990 and 39999?

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 39990 and 39999 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 39990 and 39999, than apply into the LCM equation.

GCF(39990,39999) = 3
LCM(39990,39999) = ( 39990 × 39999) / 3
LCM(39990,39999) = 1599560010 / 3
LCM(39990,39999) = 533186670

Least Common Multiple (LCM) of 39990 and 39999 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 39990 and 39999. First we will calculate the prime factors of 39990 and 39999.

Prime Factorization of 39990

Prime Factorization of 39999

Now multiplying the highest exponent prime factors to calculate the LCM of 39990 and 39999.

LCM(39990,39999) = 2¹ × 3¹ × 5¹ × 31¹ × 43¹ × 67¹ × 199¹
LCM(39990,39999) = 533186670