18685356 has 12 divisors (see below), whose sum is σ = 43599192. Its totient is φ = 6228448.

The previous prime is 18685351. The next prime is 18685357. The reversal of 18685356 is 65358681.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18685351) 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, 778545 + ... + 778568.

It is an arithmetic number, because the mean of its divisors is an integer number (3633266).

Almost surely, 2^18685356 is an apocalyptic number.

It is an amenable number.

18685356 is an abundant number, since it is smaller than the sum of its proper divisors (24913836).

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

18685356 is a wasteful number, since it uses less digits than its factorization.

18685356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557120 (or 1557118 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 18685356 is about 4322.6561278917. The cubic root of 18685356 is about 265.3589818616.

The spelling of 18685356 in words is "eighteen million, six hundred eighty-five thousand, three hundred fifty-six".