18585985 has 16 divisors (see below), whose sum is σ = 24478272. Its totient is φ = 13435200.

The previous prime is 18585977. The next prime is 18585991. The reversal of 18585985 is 58958581.

It is not a de Polignac number, because 18585985 - 2³ = 18585977 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 9022 + ... + 10888.

It is an arithmetic number, because the mean of its divisors is an integer number (1529892).

Almost surely, 2^18585985 is an apocalyptic number.

It is an amenable number.

18585985 is a deficient number, since it is larger than the sum of its proper divisors (5892287).

18585985 is a wasteful number, since it uses less digits than its factorization.

18585985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its digits is 576000, while the sum is 49.

The square root of 18585985 is about 4311.1465992239. The cubic root of 18585985 is about 264.8877417011.

The spelling of 18585985 in words is "eighteen million, five hundred eighty-five thousand, nine hundred eighty-five".