Alright, let's work through 3881 times 4689 step by step
3881 × 4689 = 4689 × (3881)
+ 4689 × 1 producing 4689
+ 4689 × 80 that results in 375120
+ 4689 × 800 what gives us 3751200
+ 4689 × 3000 yielding 14067000

= 18198009
