18400085 has 8 divisors (see below), whose sum is σ = 24087456. Its totient is φ = 13381840.

The previous prime is 18400073. The next prime is 18400091. The reversal of 18400085 is 58000481.

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

It is not a de Polignac number, because 18400085 - 2¹⁸ = 18137941 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 167219 + ... + 167328.

It is an arithmetic number, because the mean of its divisors is an integer number (3010932).

Almost surely, 2^18400085 is an apocalyptic number.

It is an amenable number.

18400085 is a deficient number, since it is larger than the sum of its proper divisors (5687371).

18400085 is a wasteful number, since it uses less digits than its factorization.

18400085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334563.

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

The square root of 18400085 is about 4289.5320257576. The cubic root of 18400085 is about 264.0016308822.

The spelling of 18400085 in words is "eighteen million, four hundred thousand, eighty-five".