18045909 has 36 divisors (see below), whose sum is σ = 31196256. Its totient is φ = 10211832.

The previous prime is 18045889. The next prime is 18045913. The reversal of 18045909 is 90954081.

It is not a de Polignac number, because 18045909 - 2¹³ = 18037717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045919) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 175152 + ... + 175254.

Almost surely, 2^18045909 is an apocalyptic number.

It is an amenable number.

18045909 is a deficient number, since it is larger than the sum of its proper divisors (13150347).

18045909 is an frugal number, since it uses more digits than its factorization.

18045909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18045909 is about 4248.0476692241. The cubic root of 18045909 is about 262.2967569635.

The spelling of 18045909 in words is "eighteen million, forty-five thousand, nine hundred nine".