Alright, let's work through 3927810 times 40504123 step by step
3927810 × 40504123 = 40504123 × (3927810)
+ 40504123 × 0 giving us 0
+ 40504123 × 10 that is equal 405041230
+ 40504123 × 800 that equals 32403298400
+ 40504123 × 7000 yielding 283528861000
+ 40504123 × 20000 what gives us 810082460000
+ 40504123 × 900000 yielding 36453710700000
+ 40504123 × 3000000 producing 121512369000000

= 159092499360630
