No problem, we've got 3873 and 1440 to multiply
3873 × 1440 = 1440 × (3873)
+ 1440 × 3 yielding 4320
+ 1440 × 70 that is equal 100800
+ 1440 × 800 that results in 1152000
+ 1440 × 3000 what gives us 4320000

= 5577120
