Fatto matematico: 4073 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4073 is an uninteresting number.
Data storica: February 24th is the day in 1989 that Ayatollah Ruhollah Khomeini offers a US$3 million bounty for the death of The Satanic Verses author Salman Rushdie.