Hecho matemático: 5207 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 5207 is an uninteresting number.
Fecha histórica: April 3rd is the day in 1997 that the Thalit massacre begins in Algeria; all but 1 of the 53 inhabitants of Thalit are killed by guerrillas.