General fact: 4038 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4038 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4038 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: January 20th is the day in 1991 that Sudan's government imposes Islamic law nationwide, worsening the civil war between the country's Muslim north and Christian south.