Hecho general: 83723 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 83723 is an uninteresting number.
Trivia: 83723 is an unremarkable number.
Fecha histórica: March 23rd is the day in 1801 that Tsar Paul I of Russia is struck with a sword, then strangled, and finally trampled to death in his bedroom at St. Michael's Castle.