Fatto generale: 9877 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9877 is a boring number.
Trivia: 9877 is an uninteresting number.
Data storica: January 15th is the day in 1962 that the Derveni papyrus, Europe's oldest surviving manuscript dating to 340 BC, is found in northern Greece.