Neha Patil (Editor)

247 (number)

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247
  
248 →

Roman numeral
  
CCXLVII

Factorization
  
13 × 19

Binary
  
111101112

Cardinal
  
two hundred forty-seven

Ordinal
  
247th (two hundred and forty-seventh)

247 (two hundred [and] forty-seven) is the natural number following 246 and preceding 248.

Contents

In mathematics

247 is:

  • a semiprime.
  • a brilliant number (the product of two primes with the same number of digits).
  • a pentagonal number.
  • palindromic in bases 18 (DD18) and 246 (11246).
  • 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".

    In other fields

  • Sometimes (e.g. when it is used in a URL), 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 (1 km2 ≈ 247.10538 acres).

    • References

    247 (number) Wikipedia
    (Text) CC BY-SA