Fatto generale: 9989 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9989 is an unremarkable number.
Trivia: 9989 is an uninteresting number.
Data storica: May 7th is the day in 1846 that the Cambridge Chronicle, America's oldest surviving weekly newspaper, is published for the first time in Cambridge, Massachusetts.