Alright, let's work through 3865 times 2189 step by step
3865 × 2189 = 2189 × (3865)
+ 2189 × 5 which equals 10945
+ 2189 × 60 giving us 131340
+ 2189 × 800 giving us 1751200
+ 2189 × 3000 what gives us 6567000

= 8460485
