18804609 has 16 divisors (see below), whose sum is σ = 28539840. Its totient is φ = 12229920.

The previous prime is 18804589. The next prime is 18804613. The reversal of 18804609 is 90640881.

It is a happy number.

It is not a de Polignac number, because 18804609 - 2¹² = 18800513 is a prime.

It is a super-2 number, since 2×18804609² = 707226639285762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18804629) 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, 7387 + ... + 9600.

It is an arithmetic number, because the mean of its divisors is an integer number (1783740).

Almost surely, 2^18804609 is an apocalyptic number.

It is an amenable number.

18804609 is a deficient number, since it is larger than the sum of its proper divisors (9735231).

18804609 is a wasteful number, since it uses less digits than its factorization.

18804609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17037 (or 17031 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18804609 is about 4336.4281384568. The cubic root of 18804609 is about 265.9223066290.

The spelling of 18804609 in words is "eighteen million, eight hundred four thousand, six hundred nine".