No problem, we've got 2639 and 3986 to multiply
2639 × 3986 = 3986 × (2639)
+ 3986 × 9 that results in 35874
+ 3986 × 30 that results in 119580
+ 3986 × 600 resulting in 2391600
+ 3986 × 2000 which equals 7972000

= 10519054
