What is the Least Common Multiple of 13978 and 13990?

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 13978 and 13990 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 13978 and 13990, than apply into the LCM equation.

GCF(13978,13990) = 2
LCM(13978,13990) = ( 13978 × 13990) / 2
LCM(13978,13990) = 195552220 / 2
LCM(13978,13990) = 97776110

Least Common Multiple (LCM) of 13978 and 13990 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 13978 and 13990. First we will calculate the prime factors of 13978 and 13990.

Prime Factorization of 13978

Prime Factorization of 13990

Now multiplying the highest exponent prime factors to calculate the LCM of 13978 and 13990.

LCM(13978,13990) = 2¹ × 29¹ × 241¹ × 5¹ × 1399¹
LCM(13978,13990) = 97776110