Fatto generale: 9237 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9237 is a value of n for which n and 5n together use each digit 1-9 exactly once.
Trivia: 9237 is an unremarkable number.
Data storica: April 15th is the day in 1632 that Battle of Rain; Swedes under Gustavus Adolphus defeat the Holy Roman Empire during the Thirty Years' War.