What is the Least Common Multiple of 15861 and 15870?

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 15861 and 15870 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 15861 and 15870, than apply into the LCM equation.

GCF(15861,15870) = 3
LCM(15861,15870) = ( 15861 × 15870) / 3
LCM(15861,15870) = 251714070 / 3
LCM(15861,15870) = 83904690

Least Common Multiple (LCM) of 15861 and 15870 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 15861 and 15870. First we will calculate the prime factors of 15861 and 15870.

Prime Factorization of 15861

Prime Factorization of 15870

Now multiplying the highest exponent prime factors to calculate the LCM of 15861 and 15870.

LCM(15861,15870) = 3¹ × 17¹ × 311¹ × 2¹ × 5¹ × 23²
LCM(15861,15870) = 83904690