# 230 (number)

 ← 229 230 231 →
Cardinal two hundred thirty
Ordinal 230th
(two hundred and thirtieth)
Factorization 2 × 5 × 23
Roman numeral CCXXX
Binary 111001102
Ternary 221123
Quaternary 32124
Quinary 14105
Senary 10226
Octal 3468
Duodecimal 17212
Vigesimal BA20
Base 36 6E36

230 (two hundred [and] thirty) is the natural number following 229 and preceding 231.

## 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.

230 is:

## 230 – 239

231 has its own article.

232 has its own article.

233 has its own article.

234 has its own article.

235 has its own article.

U-235 is the fissile isotope of uranium used in the first atomic bombs.

236 has its own article.

237 has its own article.

238 has its own article.

239 has its own article.