No problem, we've got 4640 and 3951 to multiply
4640 × 3951 = 3951 × (4640)
+ 3951 × 0 that is equal 0
+ 3951 × 40 resulting in 158040
+ 3951 × 600 resulting in 2370600
+ 3951 × 4000 yielding 15804000

= 18332640
