18816804 has 18 divisors (see below), whose sum is σ = 47564790. Its totient is φ = 6272256.

The previous prime is 18816793. The next prime is 18816823. The reversal of 18816804 is 40861881.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 6200100 = 3552^2 + 2490^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×18816804² = 708144225548832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 522689 = 18816804 / (1 + 8 + 8 + 1 + 6 + 8 + 0 + 4).

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 5 ways as a sum of consecutive naturals, for example, 261309 + ... + 261380.

Almost surely, 2^18816804 is an apocalyptic number.

It is an amenable number.

18816804 is an abundant number, since it is smaller than the sum of its proper divisors (28747986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18816804 is a wasteful number, since it uses less digits than its factorization.

18816804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522699 (or 522694 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18816804 is about 4337.8340217210. The cubic root of 18816804 is about 265.9797787406.

The spelling of 18816804 in words is "eighteen million, eight hundred sixteen thousand, eight hundred four".