Fatto matematico: 8394 is a value of n for which n and 8n together use each digit 1-9 exactly once.
Trivia: 8394 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: December 24th is the day in 1966 that a Canadair CL-44 chartered by the United States military crashes into a small village in South Vietnam, killing 129.