231806 has 4 divisors (see below), whose sum is σ = 347712. Its totient is φ = 115902.

The previous prime is 231799. The next prime is 231809. The reversal of 231806 is 608132.

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

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231806.

It is not an unprimeable number, because it can be changed into a prime (231809) 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 as a sum of consecutive naturals, namely, 57950 + ... + 57953.

It is an arithmetic number, because the mean of its divisors is an integer number (86928).

2²³¹⁸⁰⁶ is an apocalyptic number.

231806 is a deficient number, since it is larger than the sum of its proper divisors (115906).

231806 is a wasteful number, since it uses less digits than its factorization.

231806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115905.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 231806 is about 481.4623557455. The cubic root of 231806 is about 61.4292044541.

Adding to 231806 its reverse (608132), we get a palindrome (839938).

The spelling of 231806 in words is "two hundred thirty-one thousand, eight hundred six".