18316009 has 4 divisors (see below), whose sum is σ = 18906880. Its totient is φ = 17725140.

The previous prime is 18316007. The next prime is 18316013. The reversal of 18316009 is 90061381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18316009 - 2¹ = 18316007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18316003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295389 + ... + 295450.

It is an arithmetic number, because the mean of its divisors is an integer number (4726720).

Almost surely, 2^18316009 is an apocalyptic number.

It is an amenable number.

18316009 is a deficient number, since it is larger than the sum of its proper divisors (590871).

18316009 is an equidigital number, since it uses as much as digits as its factorization.

18316009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590870.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 18316009 is about 4279.7206684549. The cubic root of 18316009 is about 263.5989136405.

The spelling of 18316009 in words is "eighteen million, three hundred sixteen thousand, nine".