18485 has 4 divisors (see below), whose sum is σ = 22188. Its totient is φ = 14784.

The previous prime is 18481. The next prime is 18493. The reversal of 18485 is 58481.

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 3844 + 14641 = 62^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 18485 - 2² = 18481 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481) 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, 1844 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (5547).

2¹⁸⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

18485 is a deficient number, since it is larger than the sum of its proper divisors (3703).

18485 is an equidigital number, since it uses as much as digits as its factorization.

18485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702.

The product of its digits is 1280, while the sum is 26.

The square root of 18485 is about 135.9595528089. The cubic root of 18485 is about 26.4407123598.

Subtracting from 18485 its product of digits (1280), we obtain a triangular number (17205 = T₁₈₅).

The spelling of 18485 in words is "eighteen thousand, four hundred eighty-five".