4,000 is the smallest positive number with disputed Roman numeral.
It is also the prize for correctly answering the first seven questions in some national editions of the game show Who Wants to Be a Millionaire? in the respective local currency, and the prize for correctly answering the first eight questions in the German game show Wer wird Millionär? in euros.
In the Hawaiian language, 4,000 is called “mano”.
- n=4,000 satisfies "n64+1 is prime"