Hecho general: 9773 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 9773 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9773 is a boring number.
Fecha histórica: October 3rd is the day in 1929 that the Kingdom of Serbs, Croats and Slovenes is renamed to Kingdom of Yugoslavia, "Land of the South Slavs".