215 (number)
215 (two hundred [and] fifteen) is the natural number following 214 and preceding 216.
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| Cardinal | two hundred fifteen | |||
| Ordinal | 215th (two hundred fifteenth) | |||
| Factorization | 5 × 43 | |||
| Divisors | 5, 43 | |||
| Greek numeral | ΣΙΕ´ | |||
| Roman numeral | CCXV | |||
| Binary | 110101112 | |||
| Ternary | 212223 | |||
| Quaternary | 31134 | |||
| Quinary | 13305 | |||
| Senary | 5556 | |||
| Octal | 3278 | |||
| Duodecimal | 15B12 | |||
| Hexadecimal | D716 | |||
| Vigesimal | AF20 | |||
| Base 36 | 5Z36 | |||
In mathematics
- 215 is a composite number and a semiprime.
- 215 is the second smallest integer (after 5) such that is twice a square: .[1]
- There are 215 sequences of four integers, counting re-arrangements as distinct, such that the sum of their reciprocals is 1.[2] These are
- 24 arrangements of (2,3,7,42), (2,3,8,24), (2,3,9,18), (2,3,10,15), (2,4,5,20) and (2,4,6,12).
- 12 arrangements of (3,3,4,12), (3,4,4,6), (2,3,12,12), (2,4,8,8) and (2,5,5,10).
- 6 arrangements of (3,3,6,6).
- 4 arrangements of (2,6,6,6).
- 1 arrangement of (4,4,4,4).
In other fields
- 215 Oenone is a main belt asteroid.
- E215 is the E number of Sodium ethyl para-hydroxybenzoate.
- There are several highways numbered 215.
215 is also:
- The Dewey Decimal Classification for Science and religion.
- The year AD 215 or 215 BC
- 215 is often used as slang for marijuana, from California Proposition 215, legalizing it for medical use.
- The first area code of metropolitan Philadelphia, Pennsylvania
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