230781 has 8 divisors (see below), whose sum is σ = 315040. Its totient is φ = 150192.

The previous prime is 230779. The next prime is 230807. The reversal of 230781 is 187032.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 230781 - 2¹ = 230779 is a prime.

It is a super-2 number, since 2×230781² = 106519739922, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (230761) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 766 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (39380).

2²³⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

230781 is a deficient number, since it is larger than the sum of its proper divisors (84259).

230781 is a wasteful number, since it uses less digits than its factorization.

230781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 230781 is about 480.3967110628. The cubic root of 230781 is about 61.3385280992.

The spelling of 230781 in words is "two hundred thirty thousand, seven hundred eighty-one".