Alright, let's work through 1639 times 3467 step by step
1639 × 3467 = 3467 × (1639)
+ 3467 × 9 giving us 31203
+ 3467 × 30 producing 104010
+ 3467 × 600 producing 2080200
+ 3467 × 1000 yielding 3467000

= 5682413
