18385085 has 4 divisors (see below), whose sum is σ = 22062108. Its totient is φ = 14708064.

The previous prime is 18385069. The next prime is 18385091. The reversal of 18385085 is 58058381.

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 9498724 + 8886361 = 3082^2 + 2981^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385085 - 2⁴ = 18385069 is a prime.

It is a super-2 number, since 2×18385085² = 676022700914450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1838504 + ... + 1838513.

It is an arithmetic number, because the mean of its divisors is an integer number (5515527).

Almost surely, 2^18385085 is an apocalyptic number.

It is an amenable number.

18385085 is a deficient number, since it is larger than the sum of its proper divisors (3677023).

18385085 is an equidigital number, since it uses as much as digits as its factorization.

18385085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677022.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 18385085 is about 4287.7832267968. The cubic root of 18385085 is about 263.9298721369.

The spelling of 18385085 in words is "eighteen million, three hundred eighty-five thousand, eighty-five".