247 (number)

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

This article is about the number 247. It is not to be confused with 24/7.
← 246 247 248 →
Cardinaltwo hundred forty-seven
Ordinal247th
(two hundred forty-seventh)
Factorization13 × 19
Greek numeralΣΜΖ´
Roman numeralCCXLVII
Binary111101112
Ternary1000113
Senary10516
Octal3678
Duodecimal18712
HexadecimalF716

Additionally, 247 is:

  • a semiprime.
  • a brilliant number (the product of two primes with the same number of digits).[1]
  • a pentagonal number.[2]
  • palindromic in base 18 (DD18).
  • 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.[3]

References
  1. "Sloane's A078972 : Brilliant numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  2. "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  3. Friedman, Erich. "What's Special About This Number?". stetson.edu. Archived from the original on 23 February 2018. Retrieved 15 April 2016.
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