18557404 has 12 divisors (see below), whose sum is σ = 34385904. Its totient is φ = 8732864.

The previous prime is 18557401. The next prime is 18557423. The reversal of 18557404 is 40475581.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 18557404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557401) 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, 136384 + ... + 136519.

It is an arithmetic number, because the mean of its divisors is an integer number (2865492).

Almost surely, 2^18557404 is an apocalyptic number.

It is an amenable number.

18557404 is a deficient number, since it is larger than the sum of its proper divisors (15828500).

18557404 is a wasteful number, since it uses less digits than its factorization.

18557404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272924 (or 272922 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 18557404 is about 4307.8305444852. The cubic root of 18557404 is about 264.7518930933.

The spelling of 18557404 in words is "eighteen million, five hundred fifty-seven thousand, four hundred four".