Alright, let's work through 1859 times 8165 step by step
1859 × 8165 = 8165 × (1859)
+ 8165 × 9 that equals 73485
+ 8165 × 50 that results in 408250
+ 8165 × 800 resulting in 6532000
+ 8165 × 1000 that results in 8165000

= 15178735
