18479809 has 8 divisors (see below), whose sum is σ = 19179072. Its totient is φ = 17792880.

The previous prime is 18479753. The next prime is 18479819. The reversal of 18479809 is 90897481.

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 18479809 - 2⁹ = 18479297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18479819) 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, 27 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (2397384).

Almost surely, 2^18479809 is an apocalyptic number.

It is an amenable number.

18479809 is a deficient number, since it is larger than the sum of its proper divisors (699263).

18479809 is an equidigital number, since it uses as much as digits as its factorization.

18479809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18479809 is about 4298.8148366730. The cubic root of 18479809 is about 264.3823708094.

The spelling of 18479809 in words is "eighteen million, four hundred seventy-nine thousand, eight hundred nine".