247 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred forty-seven | |||
| Ordinal | 247th (two hundred forty-seventh) | |||
| Factorization | 13 × 19 | |||
| Greek numeral | ΣΜΖ´ | |||
| Roman numeral | CCXLVII | |||
| Binary | 111101112 | |||
| Ternary | 1000113 | |||
| Senary | 10516 | |||
| Octal | 3678 | |||
| Duodecimal | 18712 | |||
| Hexadecimal | F716 | |||
247 (two hundred [and] forty-seven) is the natural number following 246 and preceding 248.
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
[edit]- ^ "Sloane's A078972 : Brilliant numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ Friedman, Erich. "What's Special About This Number?". stetson.edu. Archived from the original on 23 February 2018. Retrieved 15 April 2016.