247 (number)

247 is the natural number following 246 and preceding 248.
Additionally, 247 is:

a semiprime.
a brilliant number.
a pentagonal number.
palindromic in base 18.
a Harshad number in bases 10, 14, 19, 20, 27, 39, 40, 58, 77, 79, 115, 118, 229 and 235.
the smallest number which can be expressed as the difference between two integers that contain together all the decimal digits 0–9. i.e. 247 = 50123 - 49876.