Alright, let's work through 39812303 times 41856397 step by step
39812303 × 41856397 = 41856397 × (39812303)
+ 41856397 × 3 producing 125569191
+ 41856397 × 00 resulting in 0
+ 41856397 × 300 yielding 12556919100
+ 41856397 × 2000 yielding 83712794000
+ 41856397 × 10000 that results in 418563970000
+ 41856397 × 800000 that equals 33485117600000
+ 41856397 × 9000000 yielding 376707573000000
+ 41856397 × 30000000 yielding 1255691910000000

= 1666399559852291
