Alright, let's work through 42394307 times 40172536 step by step
42394307 × 40172536 = 40172536 × (42394307)
+ 40172536 × 7 giving us 281207752
+ 40172536 × 00 which equals 0
+ 40172536 × 300 resulting in 12051760800
+ 40172536 × 4000 resulting in 160690144000
+ 40172536 × 90000 resulting in 3615528240000
+ 40172536 × 300000 producing 12051760800000
+ 40172536 × 2000000 that results in 80345072000000
+ 40172536 × 40000000 which equals 1606901440000000

= 1703086824152552
