Alright, let's work through 3985 times 8139 step by step
3985 × 8139 = 8139 × (3985)
+ 8139 × 5 giving us 40695
+ 8139 × 80 producing 651120
+ 8139 × 900 resulting in 7325100
+ 8139 × 3000 resulting in 24417000

= 32433915
