No problem, we've got 1841 and 8640 to multiply
1841 × 8640 = 8640 × (1841)
+ 8640 × 1 yielding 8640
+ 8640 × 40 which equals 345600
+ 8640 × 800 that is equal 6912000
+ 8640 × 1000 producing 8640000

= 15906240
