18686804 has 18 divisors (see below), whose sum is σ = 34516314. Its totient is φ = 8850960.

The previous prime is 18686797. The next prime is 18686807. The reversal of 18686804 is 40868681.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 1214404 = 4180^2 + 1102^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686807) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 5027 + ... + 7914.

It is an arithmetic number, because the mean of its divisors is an integer number (1917573).

Almost surely, 2^18686804 is an apocalyptic number.

It is an amenable number.

18686804 is a deficient number, since it is larger than the sum of its proper divisors (15829510).

18686804 is a wasteful number, since it uses less digits than its factorization.

18686804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12983 (or 12962 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 18686804 is about 4322.8236142596. The cubic root of 18686804 is about 265.3658362468.

The spelling of 18686804 in words is "eighteen million, six hundred eighty-six thousand, eight hundred four".