18545 has 4 divisors (see below), whose sum is σ = 22260. Its totient is φ = 14832.

The previous prime is 18541. The next prime is 18553. The reversal of 18545 is 54581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5776 + 12769 = 76^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 18545 - 2² = 18541 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18545.

It is not an unprimeable number, because it can be changed into a prime (18541) 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, 1850 + ... + 1859.

It is an arithmetic number, because the mean of its divisors is an integer number (5565).

2¹⁸⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

18545 is a deficient number, since it is larger than the sum of its proper divisors (3715).

18545 is an equidigital number, since it uses as much as digits as its factorization.

18545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714.

The product of its digits is 800, while the sum is 23.

The square root of 18545 is about 136.1800279042. The cubic root of 18545 is about 26.4692892125.

The spelling of 18545 in words is "eighteen thousand, five hundred forty-five".