329991 has 8 divisors (see below), whose sum is σ = 455280. Its totient is φ = 212352.

The previous prime is 329977. The next prime is 329993. The reversal of 329991 is 199923.

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

It is not a de Polignac number, because 329991 - 2⁷ = 329863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (329993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1810 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (56910).

2³²⁹⁹⁹¹ is an apocalyptic number.

329991 is a deficient number, since it is larger than the sum of its proper divisors (125289).

329991 is a wasteful number, since it uses less digits than its factorization.

329991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825.

The product of its digits is 4374, while the sum is 33.

The square root of 329991 is about 574.4484311059. The cubic root of 329991 is about 69.1036040741.

The spelling of 329991 in words is "three hundred twenty-nine thousand, nine hundred ninety-one".