Alright, let's work through 3861 times 1604 step by step
3861 × 1604 = 1604 × (3861)
+ 1604 × 1 what gives us 1604
+ 1604 × 60 what gives us 96240
+ 1604 × 800 giving us 1283200
+ 1604 × 3000 that equals 4812000

= 6193044
