18500136 has 16 divisors (see below), whose sum is σ = 46250400. Its totient is φ = 6166704.

The previous prime is 18500117. The next prime is 18500161. The reversal of 18500136 is 63100581.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 770839 = 18500136 / (1 + 8 + 5 + 0 + 0 + 1 + 3 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385396 + ... + 385443.

It is an arithmetic number, because the mean of its divisors is an integer number (2890650).

Almost surely, 2^18500136 is an apocalyptic number.

It is an amenable number.

18500136 is an abundant number, since it is smaller than the sum of its proper divisors (27750264).

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

18500136 is a wasteful number, since it uses less digits than its factorization.

18500136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770848 (or 770844 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 18500136 is about 4301.1784431711. The cubic root of 18500136 is about 264.4792717249.

The spelling of 18500136 in words is "eighteen million, five hundred thousand, one hundred thirty-six".