Let's calculate 2143 x 7809
2143 × 7809 = 7809 × (2143)
+ 7809 × 3 that is equal 23427
+ 7809 × 40 what gives us 312360
+ 7809 × 100 that is equal 780900
+ 7809 × 2000 resulting in 15618000

= 16734687
