243421404 has 24 divisors (see below), whose sum is σ = 574828800. Its totient is φ = 80162544.

The previous prime is 243421379. The next prime is 243421411. The reversal of 243421404 is 404124342.

It is a happy number.

243421404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121204 + ... + 123195.

It is an arithmetic number, because the mean of its divisors is an integer number (23951200).

Almost surely, 2^243421404 is an apocalyptic number.

It is an amenable number.

243421404 is an abundant number, since it is smaller than the sum of its proper divisors (331407396).

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

243421404 is a wasteful number, since it uses less digits than its factorization.

243421404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244489 (or 244487 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 243421404 is about 15601.9679527936. The cubic root of 243421404 is about 624.3856610848.

Adding to 243421404 its reverse (404124342), we get a palindrome (647545746).

The spelling of 243421404 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred four".