Enter your number (decimal, 0xhexadecimal or 0octal)
Show matching user-submitted "special" numbers
Test for prime factors (somewhat CPU costly)

Thanks to a semi-handy PHP function you can also enter a date & time in some North-American format.
Remember, they put the month first, like in 01/22/1970 13:14:15.
If you enter ONLY a time the date will today in the server's timezone.
The date you enter is interpreted as Universal (GMT) time, however...
Confused? Don't worry, it only gets worse from here on!
Date & time (or leave empty)
Now hit [Enter] or press the button:

Any suggestions (for finding interesting properties of numbers, that is) are welcome in the Forum.

Click here to see the PHP source, if you're interested.