Alright, let's work through 1809 times 8003 step by step
1809 × 8003 = 8003 × (1809)
+ 8003 × 9 what gives us 72027
+ 8003 × 00 that equals 0
+ 8003 × 800 that is equal 6402400
+ 8003 × 1000 yielding 8003000

= 14477427
