Fatto generale: 844 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 844 is the smallest number so that it and the next four numbers are squareful numbers.
Trivia: 844 is a boring number.
Data storica: April 23rd is the day in 1951 that American journalist William N. Oatis is arrested for espionage by the Communist government of Czechoslovakia.