Fatto generale: 23009 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 23009 is an unremarkable number.
Trivia: 23009 is an unremarkable number.
Data storica: December 29th is the day in 1835 that the Treaty of New Echota is signed, ceding all the lands of the Cherokee east of the Mississippi River to the United States.