243940904 has 16 divisors (see below), whose sum is σ = 467121600. Its totient is φ = 119375152.

The previous prime is 243940843. The next prime is 243940909. The reversal of 243940904 is 409049342.

It is not an unprimeable number, because it can be changed into a prime (243940909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324014 + ... + 324765.

It is an arithmetic number, because the mean of its divisors is an integer number (29195100).

Almost surely, 2^243940904 is an apocalyptic number.

It is an amenable number.

243940904 is a deficient number, since it is larger than the sum of its proper divisors (223180696).

243940904 is a wasteful number, since it uses less digits than its factorization.

243940904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648832 (or 648828 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 243940904 is about 15618.6076203995. The cubic root of 243940904 is about 624.8295249188.

The spelling of 243940904 in words is "two hundred forty-three million, nine hundred forty thousand, nine hundred four".