Alright, let's work through 3945 times 1439 step by step
3945 × 1439 = 1439 × (3945)
+ 1439 × 5 which equals 7195
+ 1439 × 40 that results in 57560
+ 1439 × 900 that is equal 1295100
+ 1439 × 3000 producing 4317000

= 5676855
