Alright, let's work through 1867 times 1787 step by step
1867 × 1787 = 1787 × (1867)
+ 1787 × 7 that results in 12509
+ 1787 × 60 resulting in 107220
+ 1787 × 800 giving us 1429600
+ 1787 × 1000 yielding 1787000

= 3336329
