18329009 has 8 divisors (see below), whose sum is σ = 19881288. Its totient is φ = 16829440.

The previous prime is 18328997. The next prime is 18329011. The reversal of 18329009 is 90092381.

It can be written as a sum of positive squares in 4 ways, for example, as 1081600 + 17247409 = 1040^2 + 4153^2 .

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 18329009 - 2¹² = 18324913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18329089) 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, 12452 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (2485161).

Almost surely, 2^18329009 is an apocalyptic number.

It is an amenable number.

18329009 is a deficient number, since it is larger than the sum of its proper divisors (1552279).

18329009 is a wasteful number, since it uses less digits than its factorization.

18329009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26355.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 18329009 is about 4281.2391897674. The cubic root of 18329009 is about 263.6612630214.

It can be divided in two parts, 183 and 29009, that added together give a palindrome (29192).

The spelling of 18329009 in words is "eighteen million, three hundred twenty-nine thousand, nine".