No problem, we've got 2639 and 3967 to multiply
2639 × 3967 = 3967 × (2639)
+ 3967 × 9 giving us 35703
+ 3967 × 30 what gives us 119010
+ 3967 × 600 that equals 2380200
+ 3967 × 2000 what gives us 7934000

= 10468913
