General fact: 4115 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4115 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4115 is an uninteresting number.
Historical date: April 7th is the day in 1927 that First distance public television broadcast (from Washington, D.C., to New York City, displaying the image of Commerce Secretary Herbert Hoover).