Fatto generale: 9873 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9873 is a boring number.
Trivia: 9873 is a boring number.
Data storica: January 11th is the day in 1994 that the Irish Government announces the end of a 15-year broadcasting ban on the IRA and its political arm Sinn Féin.