Alright, let's work through 3967 times 1389 step by step
3967 × 1389 = 1389 × (3967)
+ 1389 × 7 giving us 9723
+ 1389 × 60 that results in 83340
+ 1389 × 900 resulting in 1250100
+ 1389 × 3000 producing 4167000

= 5510163
