230905 has 4 divisors (see below), whose sum is σ = 277092. Its totient is φ = 184720.

The previous prime is 230891. The next prime is 230929. The reversal of 230905 is 509032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135424 + 95481 = 368^2 + 309^2 .

It is not a de Polignac number, because 230905 - 2⁵ = 230873 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23086 + ... + 23095.

It is an arithmetic number, because the mean of its divisors is an integer number (69273).

2²³⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

230905 is a deficient number, since it is larger than the sum of its proper divisors (46187).

230905 is an equidigital number, since it uses as much as digits as its factorization.

230905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46186.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 230905 is about 480.5257537323. The cubic root of 230905 is about 61.3495119838.

Adding to 230905 its reverse (509032), we get a palindrome (739937).

The spelling of 230905 in words is "two hundred thirty thousand, nine hundred five".