Alright, let's work through 39823925 times 99983516 step by step
39823925 × 99983516 = 99983516 × (39823925)
+ 99983516 × 5 what gives us 499917580
+ 99983516 × 20 that is equal 1999670320
+ 99983516 × 900 resulting in 89985164400
+ 99983516 × 3000 yielding 299950548000
+ 99983516 × 20000 that equals 1999670320000
+ 99983516 × 800000 yielding 79986812800000
+ 99983516 × 9000000 that is equal 899851644000000
+ 99983516 × 30000000 giving us 2999505480000000

= 3981736042420300
