Hecho general: 4709 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4709 is the number of symmetric plane partitions of 31.
Trivia: 4709 is a boring number.
Fecha histórica: November 21st is the day in 1918 that a pogrom takes place in Lwów (now Lviv); over three days, at least 50 Jews and 270 Ukrainian Christians are killed by Poles.