18499 has 4 divisors (see below), whose sum is σ = 19936. Its totient is φ = 17064.

The previous prime is 18493. The next prime is 18503. The reversal of 18499 is 99481.

18499 = 53² + 54² + ... + 58².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99481 = 53 ⋅1877.

It is a cyclic number.

It is not a de Polignac number, because 18499 - 2⁷ = 18371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18499.

It is not an unprimeable number, because it can be changed into a prime (18493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (4984).

2¹⁸⁴⁹⁹ is an apocalyptic number.

18499 is a deficient number, since it is larger than the sum of its proper divisors (1437).

18499 is a wasteful number, since it uses less digits than its factorization.

18499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436.

The product of its digits is 2592, while the sum is 31.

The square root of 18499 is about 136.0110289646. The cubic root of 18499 is about 26.4473858168.

It can be divided in two parts, 1849 and 9, that multiplied together give a square (16641 = 129²).

The spelling of 18499 in words is "eighteen thousand, four hundred ninety-nine".