18245 has 8 divisors (see below), whose sum is σ = 22680. Its totient is φ = 14080.

The previous prime is 18233. The next prime is 18251. The reversal of 18245 is 54281.

It can be written as a sum of positive squares in 4 ways, for example, as 289 + 17956 = 17^2 + 134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18245 - 2⁴ = 18229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 249.

It is an arithmetic number, because the mean of its divisors is an integer number (2835).

2¹⁸²⁴⁵ is an apocalyptic number.

It is an amenable number.

18245 is a deficient number, since it is larger than the sum of its proper divisors (4435).

18245 is an equidigital number, since it uses as much as digits as its factorization.

18245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135.

The product of its digits is 320, while the sum is 20.

The square root of 18245 is about 135.0740537631. The cubic root of 18245 is about 26.3257825206.

Subtracting from 18245 its sum of digits (20), we obtain a square (18225 = 135²).

The spelling of 18245 in words is "eighteen thousand, two hundred forty-five".