Alright, let's work through 40015087 times 97396963 step by step
40015087 × 97396963 = 97396963 × (40015087)
+ 97396963 × 7 what gives us 681778741
+ 97396963 × 80 what gives us 7791757040
+ 97396963 × 000 resulting in 0
+ 97396963 × 5000 that equals 486984815000
+ 97396963 × 10000 that equals 973969630000
+ 97396963 × 000000 what gives us 0
+ 97396963 × 0000000 giving us 0
+ 97396963 × 40000000 that equals 3895878520000000

= 3897347947980781
