18006009 has 32 divisors (see below), whose sum is σ = 30007296. Its totient is φ = 9365760.

The previous prime is 18005993. The next prime is 18006017. The reversal of 18006009 is 90060081.

It is not a de Polignac number, because 18006009 - 2⁴ = 18005993 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18006009.

It is not an unprimeable number, because it can be changed into a prime (18006019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10254 + ... + 11880.

It is an arithmetic number, because the mean of its divisors is an integer number (937728).

Almost surely, 2^18006009 is an apocalyptic number.

It is an amenable number.

18006009 is a deficient number, since it is larger than the sum of its proper divisors (12001287).

18006009 is a wasteful number, since it uses less digits than its factorization.

18006009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18006009 is about 4243.3487954680. The cubic root of 18006009 is about 262.1032992041.

The spelling of 18006009 in words is "eighteen million, six thousand, nine".