243804 has 24 divisors (see below), whose sum is σ = 620928. Its totient is φ = 73840.

The previous prime is 243799. The next prime is 243809. The reversal of 243804 is 408342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243799) and next prime (243809).

It is a nialpdrome in base 12.

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 243804.

It is not an unprimeable number, because it can be changed into a prime (243809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792 + ... + 1055.

It is an arithmetic number, because the mean of its divisors is an integer number (25872).

2²⁴³⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

243804 is an abundant number, since it is smaller than the sum of its proper divisors (377124).

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

243804 is a wasteful number, since it uses less digits than its factorization.

243804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865 (or 1863 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 243804 is about 493.7651263506. The cubic root of 243804 is about 62.4712614542.

It can be divided in two parts, 24 and 3804, that added together give a triangular number (3828 = T₈₇).

The spelling of 243804 in words is "two hundred forty-three thousand, eight hundred four".