18387085 has 8 divisors (see below), whose sum is σ = 22102776. Its totient is φ = 14684160.

The previous prime is 18387077. The next prime is 18387091. The reversal of 18387085 is 58078381.

It can be written as a sum of positive squares in 4 ways, for example, as 797449 + 17589636 = 893^2 + 4194^2 .

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

It is not a de Polignac number, because 18387085 - 2³ = 18387077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (2762847).

Almost surely, 2^18387085 is an apocalyptic number.

It is an amenable number.

18387085 is a deficient number, since it is larger than the sum of its proper divisors (3715691).

18387085 is an equidigital number, since it uses as much as digits as its factorization.

18387085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6383.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18387085 is about 4288.0164411998. The cubic root of 18387085 is about 263.9394422242.

The spelling of 18387085 in words is "eighteen million, three hundred eighty-seven thousand, eighty-five".