Alright, let's work through 3989 times 6571 step by step
3989 × 6571 = 6571 × (3989)
+ 6571 × 9 which equals 59139
+ 6571 × 80 that results in 525680
+ 6571 × 900 which equals 5913900
+ 6571 × 3000 that is equal 19713000

= 26211719
