Alright, let's work through 4039 times 1609 step by step
4039 × 1609 = 1609 × (4039)
+ 1609 × 9 yielding 14481
+ 1609 × 30 giving us 48270
+ 1609 × 000 yielding 0
+ 1609 × 4000 producing 6436000

= 6498751
