Alright, let's work through 3819 times 1989 step by step
3819 × 1989 = 1989 × (3819)
+ 1989 × 9 that results in 17901
+ 1989 × 10 what gives us 19890
+ 1989 × 800 that equals 1591200
+ 1989 × 3000 producing 5967000

= 7595991
