Alright, let's work through 1840 times 1390 step by step
1840 × 1390 = 1390 × (1840)
+ 1390 × 0 yielding 0
+ 1390 × 40 producing 55600
+ 1390 × 800 giving us 1112000
+ 1390 × 1000 resulting in 1390000

= 2557600
