Fatto generale: 1850 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1850 is (10^{3} + 10^{4} + 10^{5}) / (3 × 4 × 5).
Trivia: 1850 is an uninteresting number.
Data storica: January 23rd is the day in 1960 that the bathyscaphe USS Trieste breaks a depth record by descending to 10,911 m (35,798 feet) in the Pacific Ocean.