General fact: 853 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 853 is the number of connected graphs with 7 vertices.
Trivia: 853 is a boring number.
Historical date: May 2nd is the day in 2008 that Cyclone Nargis makes landfall in Myanmar killing over 138,000 people and leaving millions of people homeless.