Alright, let's work through 3983 times 409 step by step
3983 × 409 = 409 × (3983)
+ 409 × 3 producing 1227
+ 409 × 80 resulting in 32720
+ 409 × 900 that equals 368100
+ 409 × 3000 yielding 1227000

= 1629047
