247 (number)
247 is the natural number following 246 and preceding 248.In mathematics
247 is:
- a semiprime.
- a brilliant number.
- a pentagonal number.
- palindromic in bases 18 and 246.
- 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 digits 0-9. i.e. 247 = 50123 - 49876.
The mathematician and philosopher Alex Bellos suggested in 2014 that a candidate for the lowest uninteresting number would be 247 because it was, at the time, "the lowest number not to have its own page on English Wikipedia".- Sometimes, 247 is used as an alternative to 24/7, an abbreviation which means "24 hours a day, 7 days a week".
- Approximate number of acres in a square kilometer.
