Alright, let's work through 42879854 times 40039349 step by step
42879854 × 40039349 = 40039349 × (42879854)
+ 40039349 × 4 giving us 160157396
+ 40039349 × 50 resulting in 2001967450
+ 40039349 × 800 producing 32031479200
+ 40039349 × 9000 that results in 360354141000
+ 40039349 × 70000 that results in 2802754430000
+ 40039349 × 800000 giving us 32031479200000
+ 40039349 × 2000000 what gives us 80078698000000
+ 40039349 × 40000000 that is equal 1601573960000000

= 1716881439375046
