No problem, we've got 3821 and 1790 to multiply
3821 × 1790 = 1790 × (3821)
+ 1790 × 1 what gives us 1790
+ 1790 × 20 resulting in 35800
+ 1790 × 800 resulting in 1432000
+ 1790 × 3000 that equals 5370000

= 6839590
