231804 has 36 divisors (see below), whose sum is σ = 602784. Its totient is φ = 75072.

The previous prime is 231799. The next prime is 231809. The reversal of 231804 is 408132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231799) and next prime (231809).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231809) by changing a digit.

231804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1624 + ... + 1760.

It is an arithmetic number, because the mean of its divisors is an integer number (16744).

2²³¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301392).

231804 is an abundant number, since it is smaller than the sum of its proper divisors (370980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231804 is a wasteful number, since it uses less digits than its factorization.

231804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 231804 is about 481.4602787354. The cubic root of 231804 is about 61.4290277851.

Adding to 231804 its reverse (408132), we get a palindrome (639936).

It can be divided in two parts, 231 and 804, that added together give a triangular number (1035 = T₄₅).

The spelling of 231804 in words is "two hundred thirty-one thousand, eight hundred four".