823

823 is a prime number.

821 and 823 form a twin prime pair. 823 forms a prime quadruplet with 821, 827, and 829.

823 = 12345/(1 + 2 + 3 + 4 + 5).

823 is a number that does not have any digits in common with its cube (557441767).

Victor Hugo's novel Les Misérables contains a sentence of 823 words, one of the longest sentences in the French language.

Source: Prime Curios!