18027009 has 128 divisors (see below), whose sum is σ = 38707200. Its totient is φ = 7983360.

The previous prime is 18026959. The next prime is 18027011. The reversal of 18027009 is 90072081.

It is not a de Polignac number, because 18027009 - 2⁸ = 18026753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18027059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 621607 + ... + 621635.

It is an arithmetic number, because the mean of its divisors is an integer number (302400).

Almost surely, 2^18027009 is an apocalyptic number.

It is an amenable number.

18027009 is an abundant number, since it is smaller than the sum of its proper divisors (20680191).

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

18027009 is a wasteful number, since it uses less digits than its factorization.

18027009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18027009 is about 4245.8225351515. The cubic root of 18027009 is about 262.2051546620.

The spelling of 18027009 in words is "eighteen million, twenty-seven thousand, nine".