Alright, let's work through 40120459 times 47452538 step by step
40120459 × 47452538 = 47452538 × (40120459)
+ 47452538 × 9 which equals 427072842
+ 47452538 × 50 which equals 2372626900
+ 47452538 × 400 that is equal 18981015200
+ 47452538 × 0000 giving us 0
+ 47452538 × 20000 resulting in 949050760000
+ 47452538 × 100000 what gives us 4745253800000
+ 47452538 × 0000000 resulting in 0
+ 47452538 × 40000000 producing 1898101520000000

= 1903817605274942
