18680986 has 8 divisors (see below), whose sum is σ = 28092564. Its totient is φ = 9316800.

The previous prime is 18680929. The next prime is 18680989. The reversal of 18680986 is 68908681.

It can be written as a sum of positive squares in 2 ways, for example, as 18653761 + 27225 = 4319^2 + 165^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18680989) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10845 + ... + 12448.

Almost surely, 2^18680986 is an apocalyptic number.

18680986 is a deficient number, since it is larger than the sum of its proper divisors (9411578).

18680986 is a wasteful number, since it uses less digits than its factorization.

18680986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23696.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 18680986 is about 4322.1506220862. The cubic root of 18680986 is about 265.3382934829.

The spelling of 18680986 in words is "eighteen million, six hundred eighty thousand, nine hundred eighty-six".