Fatto generale: 4473 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4473 is a value of n for which s(n) = 2reverse(n).
Trivia: 4473 is an unremarkable number.
Data storica: March 30th is the day in 1885 that the Battle for Kushka triggers the Panjdeh Incident which nearly gives rise to war between the British Empire and Russian Empire.