18685308 has 12 divisors (see below), whose sum is σ = 43599080. Its totient is φ = 6228432.

The previous prime is 18685307. The next prime is 18685313. The reversal of 18685308 is 80358681.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778543 + ... + 778566.

Almost surely, 2^18685308 is an apocalyptic number.

It is an amenable number.

18685308 is an abundant number, since it is smaller than the sum of its proper divisors (24913772).

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

18685308 is a wasteful number, since it uses less digits than its factorization.

18685308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557116 (or 1557114 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18685308 is about 4322.6505757463. The cubic root of 18685308 is about 265.3587546384.

The spelling of 18685308 in words is "eighteen million, six hundred eighty-five thousand, three hundred eight".