Hecho general: 4207 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4207 is the number of cubic graphs with 16 vertices.
Trivia: 4207 is an uninteresting number.
Fecha histórica: July 8th is the day in 1948 that the United States Air Force accepts its first female recruits into a program called Women in the Air Force (WAF).