18057986 has 8 divisors (see below), whose sum is σ = 27108300. Its totient is φ = 9021888.

The previous prime is 18057973. The next prime is 18057989. The reversal of 18057986 is 68975081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16248961 + 1809025 = 4031^2 + 1345^2 .

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 (18057989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 6038.

Almost surely, 2^18057986 is an apocalyptic number.

18057986 is a deficient number, since it is larger than the sum of its proper divisors (9050314).

18057986 is a wasteful number, since it uses less digits than its factorization.

18057986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18057986 is about 4249.4689079931. The cubic root of 18057986 is about 262.3552568621.

The spelling of 18057986 in words is "eighteen million, fifty-seven thousand, nine hundred eighty-six".