Hecho general: 4006 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4006 is _{14}C_{4} + _{14}C_{0} + _{14}C_{0} + _{14}C_{6}.
Trivia: 4006 is a boring number.
Fecha histórica: December 19th is the day in 1963 that Zanzibar gains independence from the United Kingdom as a constitutional monarchy, under Sultan Jamshid bin Abdullah.