Fatto generale: 863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 863 is a value of n so that n(n+6) is a palindrome.
Trivia: 863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 12th is the day in 1191 that Richard I of England marries Berengaria of Navarre who is crowned Queen consort of England the same day.