18205986 has 8 divisors (see below), whose sum is σ = 36411984. Its totient is φ = 6068660.

The previous prime is 18205973. The next prime is 18205991. The reversal of 18205986 is 68950281.

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

18205986 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 1517160 + ... + 1517171.

It is an arithmetic number, because the mean of its divisors is an integer number (4551498).

Almost surely, 2^18205986 is an apocalyptic number.

18205986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18205986 is a wasteful number, since it uses less digits than its factorization.

18205986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034336.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 18205986 is about 4266.8473138841. The cubic root of 18205986 is about 263.0700464487.

It can be divided in two parts, 18205 and 986, that added together give a palindrome (19191).

The spelling of 18205986 in words is "eighteen million, two hundred five thousand, nine hundred eighty-six".