Alright, let's work through 3989 times 5897 step by step
3989 × 5897 = 5897 × (3989)
+ 5897 × 9 resulting in 53073
+ 5897 × 80 giving us 471760
+ 5897 × 900 yielding 5307300
+ 5897 × 3000 what gives us 17691000

= 23523133
