No problem, we've got 1389 and 5938 to multiply
1389 × 5938 = 5938 × (1389)
+ 5938 × 9 what gives us 53442
+ 5938 × 80 yielding 475040
+ 5938 × 300 that results in 1781400
+ 5938 × 1000 yielding 5938000

= 8247882
