Fatto generale: 84731 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 84731 is a boring number.
Trivia: 84731 is an unremarkable number.
Data storica: December 26th is the day in 1941 that U.S. President Franklin D. Roosevelt signs a bill establishing the fourth Thursday in November as Thanksgiving Day in the United States.