Fatto generale: 1590 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1590 is the denominator of the 52^{nd} Bernoulli number.
Trivia: 1590 is a boring number.
Data storica: May 8th is the day in 1886 that Pharmacist John Styth Pemberton first sells a carbonated beverage named "Coca-Cola" as a patent medicine.