18730209 has 8 divisors (see below), whose sum is σ = 26442720. Its totient is φ = 11752256.

The previous prime is 18730193. The next prime is 18730237. The reversal of 18730209 is 90203781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18730209 - 2⁴ = 18730193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18730289) 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, 183579 + ... + 183680.

It is an arithmetic number, because the mean of its divisors is an integer number (3305340).

Almost surely, 2^18730209 is an apocalyptic number.

It is an amenable number.

18730209 is a deficient number, since it is larger than the sum of its proper divisors (7712511).

18730209 is a wasteful number, since it uses less digits than its factorization.

18730209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367279.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 18730209 is about 4327.8411477317. The cubic root of 18730209 is about 265.5711379416.

The spelling of 18730209 in words is "eighteen million, seven hundred thirty thousand, two hundred nine".