No problem, we've got 3859 and 1523 to multiply
3859 × 1523 = 1523 × (3859)
+ 1523 × 9 resulting in 13707
+ 1523 × 50 resulting in 76150
+ 1523 × 800 what gives us 1218400
+ 1523 × 3000 that results in 4569000

= 5877257
