Fatto generale: 1870 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1870 is the product of two consecutive Fibonacci numbers.
Trivia: 1870 is a boring number.
Data storica: February 12th is the day in 1733 that Englishman James Oglethorpe founds Georgia, the 13th colony of the Thirteen Colonies, and its first city at Savannah (known as Georgia Day).