Fatto matematico: 6714 is the index of a triangular number containing only 3 different digits.
Trivia: 6714 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 19th is the day in 1919 that Mustafa Kemal Atatürk lands at Samsun on the Anatolian Black Sea coast, initiating what is later termed the Turkish War of Independence.