18099 has 6 divisors (see below), whose sum is σ = 26156. Its totient is φ = 12060.

The previous prime is 18097. The next prime is 18119. The reversal of 18099 is 99081.

18099 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 18099 - 2¹ = 18097 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18099.

It is not an unprimeable number, because it can be changed into a prime (18097) 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, 997 + ... + 1014.

2¹⁸⁰⁹⁹ is an apocalyptic number.

18099 is a deficient number, since it is larger than the sum of its proper divisors (8057).

18099 is a wasteful number, since it uses less digits than its factorization.

18099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 18099 is about 134.5325239487. The cubic root of 18099 is about 26.2553730498.

It can be divided in two parts, 1 and 8099, that added together give a square (8100 = 90²).

The spelling of 18099 in words is "eighteen thousand, ninety-nine".