391266404 has 6 divisors (see below), whose sum is σ = 684716214. Its totient is φ = 195633200.

The previous prime is 391266389. The next prime is 391266413. The reversal of 391266404 is 404662193.

It can be written as a sum of positive squares in only one way, i.e., 388168804 + 3097600 = 19702^2 + 1760^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 48908297 + ... + 48908304.

It is an arithmetic number, because the mean of its divisors is an integer number (114119369).

Almost surely, 2^391266404 is an apocalyptic number.

It is an amenable number.

391266404 is a deficient number, since it is larger than the sum of its proper divisors (293449810).

391266404 is a wasteful number, since it uses less digits than its factorization.

391266404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97816605 (or 97816603 counting only the distinct ones).

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

The square root of 391266404 is about 19780.4551009323. The cubic root of 391266404 is about 731.4043174549.

The spelling of 391266404 in words is "three hundred ninety-one million, two hundred sixty-six thousand, four hundred four".