231218404 has 24 divisors (see below), whose sum is σ = 412322400. Its totient is φ = 113420160.

The previous prime is 231218389. The next prime is 231218423. The reversal of 231218404 is 404812132.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 228652 + ... + 229660.

It is an arithmetic number, because the mean of its divisors is an integer number (17180100).

Almost surely, 2^231218404 is an apocalyptic number.

It is an amenable number.

231218404 is a deficient number, since it is larger than the sum of its proper divisors (181103996).

231218404 is a wasteful number, since it uses less digits than its factorization.

231218404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 231218404 is about 15205.8674201770. The cubic root of 231218404 is about 613.7725570250.

The spelling of 231218404 in words is "two hundred thirty-one million, two hundred eighteen thousand, four hundred four".