No problem, we've got 4238 and 3989 to multiply
4238 × 3989 = 3989 × (4238)
+ 3989 × 8 that equals 31912
+ 3989 × 30 that equals 119670
+ 3989 × 200 which equals 797800
+ 3989 × 4000 that is equal 15956000

= 16905382
