Fatto generale: 4138 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4138 is an unremarkable number.
Trivia: 4138 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 30th is the day in 2004 that U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.