Fatto generale: 13986 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 13986 is an unremarkable number.
Trivia: 13986 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 16th is the day in 1922 that the Treaty of Rapallo, pursuant to which Germany and the Soviet Union re-establish diplomatic relations, is signed.