Alright, let's work through 1389 times 9964 step by step
1389 × 9964 = 9964 × (1389)
+ 9964 × 9 yielding 89676
+ 9964 × 80 resulting in 797120
+ 9964 × 300 that results in 2989200
+ 9964 × 1000 what gives us 9964000

= 13839996
