18390085 has 8 divisors (see below), whose sum is σ = 25220736. Its totient is φ = 12610320.

The previous prime is 18390083. The next prime is 18390091. The reversal of 18390085 is 58009381.

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

It is not a de Polignac number, because 18390085 - 2¹ = 18390083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18390085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262681 + ... + 262750.

It is an arithmetic number, because the mean of its divisors is an integer number (3152592).

Almost surely, 2^18390085 is an apocalyptic number.

It is an amenable number.

18390085 is a deficient number, since it is larger than the sum of its proper divisors (6830651).

18390085 is an equidigital number, since it uses as much as digits as its factorization.

18390085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525443.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18390085 is about 4288.3662390239. The cubic root of 18390085 is about 263.9537960540.

The spelling of 18390085 in words is "eighteen million, three hundred ninety thousand, eighty-five".