18006986 has 8 divisors (see below), whose sum is σ = 27029604. Its totient is φ = 8997120.

The previous prime is 18006979. The next prime is 18006997. The reversal of 18006986 is 68960081.

It can be written as a sum of positive squares in 2 ways, for example, as 17901361 + 105625 = 4231^2 + 325^2 .

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

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, 2096 + ... + 6356.

Almost surely, 2^18006986 is an apocalyptic number.

18006986 is a deficient number, since it is larger than the sum of its proper divisors (9022618).

18006986 is a wasteful number, since it uses less digits than its factorization.

18006986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 18006986 is about 4243.4639152466. The cubic root of 18006986 is about 262.1080396641.

The spelling of 18006986 in words is "eighteen million, six thousand, nine hundred eighty-six".