Alright, let's work through 40384897 times 75421896 step by step
40384897 × 75421896 = 75421896 × (40384897)
+ 75421896 × 7 which equals 527953272
+ 75421896 × 90 resulting in 6787970640
+ 75421896 × 800 resulting in 60337516800
+ 75421896 × 4000 that equals 301687584000
+ 75421896 × 80000 yielding 6033751680000
+ 75421896 × 300000 what gives us 22626568800000
+ 75421896 × 0000000 that is equal 0
+ 75421896 × 40000000 resulting in 3016875840000000

= 3045905501504712
