Fatto generale: 356 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 356 is the smallest happy number of height 6.
Trivia: 356 is a boring number.
Data storica: December 21st is the day in 1826 that American settlers in Nacogdoches, Mexican Texas, declare their independence, starting the Fredonian Rebellion.