18528909 has 12 divisors (see below), whose sum is σ = 28738944. Its totient is φ = 10587864.

The previous prime is 18528907. The next prime is 18528911. The reversal of 18528909 is 90982581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18528907) and next prime (18528911).

It is not a de Polignac number, because 18528909 - 2¹ = 18528907 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18528907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62877 + ... + 63170.

It is an arithmetic number, because the mean of its divisors is an integer number (2394912).

Almost surely, 2^18528909 is an apocalyptic number.

It is an amenable number.

18528909 is a deficient number, since it is larger than the sum of its proper divisors (10210035).

18528909 is a wasteful number, since it uses less digits than its factorization.

18528909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126064 (or 126057 counting only the distinct ones).

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

The square root of 18528909 is about 4304.5219246741. The cubic root of 18528909 is about 264.6163143268.

The spelling of 18528909 in words is "eighteen million, five hundred twenty-eight thousand, nine hundred nine".