243404 has 12 divisors (see below), whose sum is σ = 486864. Its totient is φ = 104304.

The previous prime is 243403. The next prime is 243421. The reversal of 243404 is 404342.

243404 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (243401) 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 3 ways as a sum of consecutive naturals, for example, 4319 + ... + 4374.

It is an arithmetic number, because the mean of its divisors is an integer number (40572).

2²⁴³⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

243404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

243404 is a wasteful number, since it uses less digits than its factorization.

243404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704 (or 8702 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 243404 is about 493.3599091941. The cubic root of 243404 is about 62.4370780078.

Adding to 243404 its reverse (404342), we get a palindrome (647746).

The spelling of 243404 in words is "two hundred forty-three thousand, four hundred four", and thus it is an iban number.