329991009 has 8 divisors (see below), whose sum is σ = 441612672. Its totient is φ = 219181680.

The previous prime is 329991007. The next prime is 329991041. The reversal of 329991009 is 900199923.

It is a happy number.

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

It is not a de Polignac number, because 329991009 - 2¹ = 329991007 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (329991007) 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, 202134 + ... + 203759.

It is an arithmetic number, because the mean of its divisors is an integer number (55201584).

Almost surely, 2^329991009 is an apocalyptic number.

It is an amenable number.

329991009 is a deficient number, since it is larger than the sum of its proper divisors (111621663).

329991009 is a wasteful number, since it uses less digits than its factorization.

329991009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406167.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 329991009 is about 18165.6546537690. The cubic root of 329991009 is about 691.0360470234.

The spelling of 329991009 in words is "three hundred twenty-nine million, nine hundred ninety-one thousand, nine".