404 - Page Not Found
It is also a palindrome. Incidentally, all of its factors are also palindromes.
It is nontotient and noncototient.
The last gladiatoral competition is held in Rome on AD 404.
One of the three area codes of the Atlanta calling area is 404.
In 2008, a study found that "404" had become a slang synonym for "clueless" in the UK.
404 is the most popular HTTP standard response code.
There is a song titled 404.
The 404 error page is prone to contain hoaxes during April 1st.
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