Alright, let's work through 1389 times 464 step by step
1389 × 464 = 464 × (1389)
+ 464 × 9 that equals 4176
+ 464 × 80 giving us 37120
+ 464 × 300 what gives us 139200
+ 464 × 1000 yielding 464000

= 644496
