18047986 has 16 divisors (see below), whose sum is σ = 31088160. Its totient is φ = 7771680.

The previous prime is 18047963. The next prime is 18047989. The reversal of 18047986 is 68974081.

It is not an unprimeable number, because it can be changed into a prime (18047989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21171 + ... + 22006.

It is an arithmetic number, because the mean of its divisors is an integer number (1943010).

Almost surely, 2^18047986 is an apocalyptic number.

18047986 is a deficient number, since it is larger than the sum of its proper divisors (13040174).

18047986 is a wasteful number, since it uses less digits than its factorization.

18047986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43209.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18047986 is about 4248.2921274319. The cubic root of 18047986 is about 262.3068196221.

The spelling of 18047986 in words is "eighteen million, forty-seven thousand, nine hundred eighty-six".