Fatto generale: 18427 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 18427 is a boring number.
Trivia: 18427 is an unremarkable number.
Data storica: June 13th is the day in 1967 that U.S. President Lyndon B. Johnson nominates Solicitor-General Thurgood Marshall to become the first black justice on the U.S. Supreme Court.