Alright, let's work through 3965 times 3187 step by step
3965 × 3187 = 3187 × (3965)
+ 3187 × 5 that results in 15935
+ 3187 × 60 producing 191220
+ 3187 × 900 that equals 2868300
+ 3187 × 3000 that is equal 9561000

= 12636455
