254 (number)
254 (two hundred [and] fifty-four) is the natural number following 253 and preceding 255.
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| Cardinal | two hundred fifty-four | |||
| Ordinal | 254th (two hundred fifty-fourth) | |||
| Factorization | 2 × 127 | |||
| Divisors | 1, 2, 127, 254 | |||
| Greek numeral | ΣΝΔ´ | |||
| Roman numeral | CCLIV | |||
| Binary | 111111102 | |||
| Ternary | 1001023 | |||
| Octal | 3768 | |||
| Duodecimal | 19212 | |||
| Hexadecimal | FE16 | |||
In mathematics
- It is an even number.[1]
- Is a composite number with four divisors: 1, 2, 127 and 254.[1][2] Since the sum of its divisors (excluding the same number) is 130 < 254, is a deficient number.[2]
- It is a semiprime number.[3][1][2] Moreover, in American English, its name has a semiprime number of syllables.[3]
- It is a square-free integer.[4]
- It is a number nontotient.[5]
- It is the maximum number of regions in which a plane can be divided by 22 lines.[6]
- It is a congruent number.[4]
In other fields
- 254 nm is one of the wavelengths emitted by a mercury-vapor lamp.[7][8]
- +254 is the telephone country code of Kenya.
References
- "254 (Number)". metanumbers.com. Retrieved 2021-07-29.
- "Is 254 a prime number?". www.numbers.education. Retrieved 2021-07-29.
- "A230956 - OEIS". oeis.org. Retrieved 2021-07-29.
- Alter, Ronald; Curtz, Thaddeus B. (1974). "A note on congruent numbers". Mathematics of Computation. 28 (125): 303–305. doi:10.1090/S0025-5718-1974-0337758-9. ISSN 0025-5718.
- "A005277 - OEIS". oeis.org. Retrieved 2021-07-29.
- "A000124 - OEIS". oeis.org. Retrieved 2021-07-29.
- "Persistent Lines of Neutral Mercury (Hg I)". physics.nist.gov. Archived from the original on 2003-05-05. Retrieved 2021-07-29.
- "Atomic Spectra". hyperphysics.phy-astr.gsu.edu. Retrieved 2021-07-29.
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