Hecho general: 9847 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 9847 is an uninteresting number.
Trivia: 9847 is an uninteresting number.
Fecha histórica: December 16th is the day in 1497 that Vasco da Gama rounds the Cape of Good Hope, the point where Bartolomeu Dias had previously turned back to Portugal.