18315684 has 36 divisors (see below), whose sum is σ = 47431020. Its totient is φ = 5955840.

The previous prime is 18315673. The next prime is 18315691. The reversal of 18315684 is 48651381.

It can be written as a sum of positive squares in 2 ways, for example, as 675684 + 17640000 = 822^2 + 4200^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 4729 + ... + 7680.

Almost surely, 2^18315684 is an apocalyptic number.

It is an amenable number.

18315684 is an abundant number, since it is smaller than the sum of its proper divisors (29115336).

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

18315684 is a wasteful number, since it uses less digits than its factorization.

18315684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12460 (or 12455 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18315684 is about 4279.6826985187. The cubic root of 18315684 is about 263.5973545281.

The spelling of 18315684 in words is "eighteen million, three hundred fifteen thousand, six hundred eighty-four".