18326009 has 8 divisors (see below), whose sum is σ = 20594112. Its totient is φ = 16180560.

The previous prime is 18325987. The next prime is 18326027. The reversal of 18326009 is 90062381.

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 18326009 - 2⁸ = 18325753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18326509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30347 + ... + 30944.

It is an arithmetic number, because the mean of its divisors is an integer number (2574264).

Almost surely, 2^18326009 is an apocalyptic number.

It is an amenable number.

18326009 is a deficient number, since it is larger than the sum of its proper divisors (2268103).

18326009 is a wasteful number, since it uses less digits than its factorization.

18326009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61327.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18326009 is about 4280.8888095815. Note that the first 4 decimals coincide. The cubic root of 18326009 is about 263.6468773201.

The spelling of 18326009 in words is "eighteen million, three hundred twenty-six thousand, nine".