No problem, we've got 1667 and 3913 to multiply
1667 × 3913 = 3913 × (1667)
+ 3913 × 7 what gives us 27391
+ 3913 × 60 that results in 234780
+ 3913 × 600 that results in 2347800
+ 3913 × 1000 giving us 3913000

= 6522971
