What is the Least Common Multiple of 1398 and 1405?

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 1398 and 1405 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1398 and 1405, than apply into the LCM equation.

GCF(1398,1405) = 1
LCM(1398,1405) = ( 1398 × 1405) / 1
LCM(1398,1405) = 1964190 / 1
LCM(1398,1405) = 1964190

Least Common Multiple (LCM) of 1398 and 1405 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1398 and 1405. First we will calculate the prime factors of 1398 and 1405.

Prime Factorization of 1398

Prime Factorization of 1405

Now multiplying the highest exponent prime factors to calculate the LCM of 1398 and 1405.

LCM(1398,1405) = 2¹ × 3¹ × 233¹ × 5¹ × 281¹
LCM(1398,1405) = 1964190