18204985 has 8 divisors (see below), whose sum is σ = 21876480. Its totient is φ = 14543664.

The previous prime is 18204931. The next prime is 18205001. The reversal of 18204985 is 58940281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18204985 is a prime.

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, 2206 + ... + 6424.

It is an arithmetic number, because the mean of its divisors is an integer number (2734560).

Almost surely, 2^18204985 is an apocalyptic number.

It is an amenable number.

18204985 is a deficient number, since it is larger than the sum of its proper divisors (3671495).

18204985 is an equidigital number, since it uses as much as digits as its factorization.

18204985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18204985 is about 4266.7300125506. The cubic root of 18204985 is about 263.0652249952.

The spelling of 18204985 in words is "eighteen million, two hundred four thousand, nine hundred eighty-five".