LCM( 42823, 6409 ) = 16144271
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 42823, b = 6409 and GCD(42823, 6409) = 17.
$$ \text{LCM} (42823, 6409) = \frac{ 42823 \cdot 6409 }{ \text{GCD}(42823,6409)} = \frac{ 274452607 }{ 17 } = 16144271 $$