No problem, we've got 5009 and 7871 to multiply
5009 × 7871 = 7871 × (5009)
+ 7871 × 9 that equals 70839
+ 7871 × 00 what gives us 0
+ 7871 × 000 which equals 0
+ 7871 × 5000 which equals 39355000

= 39425839
