No problem, we've got 1239 and 6839 to multiply
1239 × 6839 = 6839 × (1239)
+ 6839 × 9 giving us 61551
+ 6839 × 30 yielding 205170
+ 6839 × 200 giving us 1367800
+ 6839 × 1000 resulting in 6839000

= 8473521
