329905 has 4 divisors (see below), whose sum is σ = 395892. Its totient is φ = 263920.

The previous prime is 329899. The next prime is 329941. The reversal of 329905 is 509923.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509923 = 419 ⋅1217.

It can be written as a sum of positive squares in 2 ways, for example, as 194481 + 135424 = 441^2 + 368^2 .

It is not a de Polignac number, because 329905 - 2⁵ = 329873 is a prime.

It is a Duffinian number.

329905 is a lucky number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32986 + ... + 32995.

It is an arithmetic number, because the mean of its divisors is an integer number (98973).

2³²⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

329905 is a deficient number, since it is larger than the sum of its proper divisors (65987).

329905 is an equidigital number, since it uses as much as digits as its factorization.

329905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65986.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 329905 is about 574.3735718154. The cubic root of 329905 is about 69.0976004495.

The spelling of 329905 in words is "three hundred twenty-nine thousand, nine hundred five".