18195009 has 16 divisors (see below), whose sum is σ = 28476288. Its totient is φ = 10115712.

The previous prime is 18194999. The next prime is 18195013. The reversal of 18195009 is 90059181.

It is not a de Polignac number, because 18195009 - 2⁴ = 18194993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18195409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10932 + ... + 12485.

It is an arithmetic number, because the mean of its divisors is an integer number (1779768).

Almost surely, 2^18195009 is an apocalyptic number.

It is an amenable number.

18195009 is a deficient number, since it is larger than the sum of its proper divisors (10281279).

18195009 is a wasteful number, since it uses less digits than its factorization.

18195009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23464.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 18195009 is about 4265.5608072093. The cubic root of 18195009 is about 263.0171645657.

The spelling of 18195009 in words is "eighteen million, one hundred ninety-five thousand, nine".