18304686 has 12 divisors (see below), whose sum is σ = 39660192. Its totient is φ = 6101556.

The previous prime is 18304681. The next prime is 18304687. The reversal of 18304686 is 68640381.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18304686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18304681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 508446 + ... + 508481.

It is an arithmetic number, because the mean of its divisors is an integer number (3305016).

Almost surely, 2^18304686 is an apocalyptic number.

18304686 is an abundant number, since it is smaller than the sum of its proper divisors (21355506).

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

18304686 is a wasteful number, since it uses less digits than its factorization.

18304686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016935 (or 1016932 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18304686 is about 4278.3975972319. The cubic root of 18304686 is about 263.5445832864.

It can be divided in two parts, 18 and 304686, that added together give a square (304704 = 552²).

The spelling of 18304686 in words is "eighteen million, three hundred four thousand, six hundred eighty-six".