18504909 has 8 divisors (see below), whose sum is σ = 27414720. Its totient is φ = 12336588.

The previous prime is 18504883. The next prime is 18504919. The reversal of 18504909 is 90940581.

It is not a de Polignac number, because 18504909 - 2¹³ = 18496717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18504919) 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 7 ways as a sum of consecutive naturals, for example, 342657 + ... + 342710.

It is an arithmetic number, because the mean of its divisors is an integer number (3426840).

Almost surely, 2^18504909 is an apocalyptic number.

It is an amenable number.

18504909 is a deficient number, since it is larger than the sum of its proper divisors (8909811).

18504909 is an equidigital number, since it uses as much as digits as its factorization.

18504909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685376 (or 685370 counting only the distinct ones).

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

The square root of 18504909 is about 4301.7332553286. The cubic root of 18504909 is about 264.5020148193.

The spelling of 18504909 in words is "eighteen million, five hundred four thousand, nine hundred nine".