No problem, we've got 4047 and 3923 to multiply
4047 × 3923 = 3923 × (4047)
+ 3923 × 7 that equals 27461
+ 3923 × 40 what gives us 156920
+ 3923 × 000 yielding 0
+ 3923 × 4000 yielding 15692000

= 15876381
