No problem, we've got 8423945 and 1388143 to multiply
8423945 × 1388143 = 1388143 × (8423945)
+ 1388143 × 5 that equals 6940715
+ 1388143 × 40 resulting in 55525720
+ 1388143 × 900 yielding 1249328700
+ 1388143 × 3000 that equals 4164429000
+ 1388143 × 20000 giving us 27762860000
+ 1388143 × 400000 which equals 555257200000
+ 1388143 × 8000000 which equals 11105144000000

= 11693640284135
