18518 has 8 divisors (see below), whose sum is σ = 28512.
Its totient is φ = 9016.
The previous prime is 18517. The next prime is 18521. The reversal of 18518 is 81581.
It is a sphenic number, since it is the product of 3 distinct primes.
18518 is an undulating number in base 14.
It is a nialpdrome in base 12.
It is a junction number, because it is equal to n+sod(n) for n = 18493 and 18502.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18517) 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, 5 + ... + 192.
It is an arithmetic number, because the mean of its divisors is an integer number (3564).
218518 is an apocalyptic number.
18518 is a deficient number, since it is larger than the sum of its proper divisors (9994).
18518 is a wasteful number, since it uses less digits than its factorization.
18518 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 246.
The product of its digits is 320, while the sum is 23.
The square root of 18518 is about 136.0808583159.
The cubic root of 18518 is about 26.4564372681.
The spelling of 18518 in words is "eighteen thousand, five hundred eighteen".