Fatto matematico: 844 is the smallest number so that it and the next four numbers are squareful numbers.
Trivia: 844 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 23rd is the day in 1990 that Namibia becomes the 160th member of the United Nations and the 50th member of the Commonwealth of Nations.