Let's calculate 3861 x 3643
3861 × 3643 = 3643 × (3861)
+ 3643 × 1 that results in 3643
+ 3643 × 60 that is equal 218580
+ 3643 × 800 that results in 2914400
+ 3643 × 3000 which equals 10929000

= 14065623
