230 (two hundred [and] thirty) is the natural number following 229 and preceding 231.
| Ordinal | two hundred (and) thirty |
| Cardinal | two hundred (and) thirtieth |
| Factorization |  |
| Roman numeral | CCXXX |
| Binary | 11100110 |
| Hexadecimal | E6 |
In mathematics
It is a composite number, with its divisors being 2, 5, 10, 23, 46, and 115. Its factorisation makes it a sphenic number. There is no integer with 230 coprimes below it, thus 230 is a nontotient. However, the sum of the coprime counts for the first 27 integers is 230.
There are 230 unique space groups describing all possible crystal symmetries.
In base 10, being divisible by the sum of its digits, 230 is a Harshad number.
In other fields
230 is:
- A common voltage in the European Union.
- The year A.D. 230 or 230 BC.
230 – 239
Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, hexagonal number, octahedral number, Mertens function returns 0, and is the number of cubic inches in a U.S. liquid gallon.
Two hundred [and] thirty-two has its own article.
Two hundred [and] thirty-three 233 prime, Fibonacci number, Sophie Germain prime, Chen prime, Eisenstein prime with no imaginary part, Markov number, self number, teenage slang for "best friends forever"
Two hundred [and] thirty-four 234 = 2·32·13, Harshad number, nontotient
Two hundred [and] thirty-five 235 = 5·47, sum of three consecutive primes (73 + 79 + 83), Mertens function returns 0, Smarandache–Wellin number, centered triangular number
U-235 is the fissile isotope of uranium used in the first atomic bombs.
Two hundred [and] thirty-six has its own article.
Two hundred [and] thirty-seven has its own article.
Two hundred [and] thirty-eight has its own article
Two hundred [and] thirty-nine has its own article.
+230 is the country code for Mauritius.
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