231320404 has 12 divisors (see below), whose sum is σ = 462640864. Its totient is φ = 99137304.

The previous prime is 231320399. The next prime is 231320413. The reversal of 231320404 is 404023132.

231320404 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4130694 + ... + 4130749.

Almost surely, 2^231320404 is an apocalyptic number.

It is an amenable number.

231320404 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.

231320404 is a wasteful number, since it uses less digits than its factorization.

231320404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8261454 (or 8261452 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 231320404 is about 15209.2210188425. The cubic root of 231320404 is about 613.8627972425.

Adding to 231320404 its reverse (404023132), we get a palindrome (635343536).

The spelling of 231320404 in words is "two hundred thirty-one million, three hundred twenty thousand, four hundred four".