Fatto matematico: 9426 is a value of n for which 5n and 7n together use each digit exactly once.
Trivia: 9426 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: October 21st is the day in 1774 that First display of the word "Liberty" on a flag, raised by colonists in Taunton, Massachusetts in defiance of British rule in Colonial America.