No problem, we've got 3897 and 4024 to multiply
3897 × 4024 = 4024 × (3897)
+ 4024 × 7 what gives us 28168
+ 4024 × 90 producing 362160
+ 4024 × 800 giving us 3219200
+ 4024 × 3000 that results in 12072000

= 15681528
