18529809 has 16 divisors (see below), whose sum is σ = 25226304. Its totient is φ = 12096000.

The previous prime is 18529801. The next prime is 18529817. The reversal of 18529809 is 90892581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18529801) and next prime (18529817).

It is not a de Polignac number, because 18529809 - 2³ = 18529801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18529801) 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, 46009 + ... + 46409.

It is an arithmetic number, because the mean of its divisors is an integer number (1576644).

Almost surely, 2^18529809 is an apocalyptic number.

It is an amenable number.

18529809 is a deficient number, since it is larger than the sum of its proper divisors (6696495).

18529809 is a wasteful number, since it uses less digits than its factorization.

18529809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 18529809 is about 4304.6264646308. The cubic root of 18529809 is about 264.6205986378.

The spelling of 18529809 in words is "eighteen million, five hundred twenty-nine thousand, eight hundred nine".