329809 has 4 divisors (see below), whose sum is σ = 340480. Its totient is φ = 319140.

The previous prime is 329803. The next prime is 329863. The reversal of 329809 is 908923.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908923 = 73 ⋅12451.

It is a cyclic number.

It is not a de Polignac number, because 329809 - 2³ = 329801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 10639 = 329809 / (3 + 2 + 9 + 8 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (329801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5289 + ... + 5350.

It is an arithmetic number, because the mean of its divisors is an integer number (85120).

2³²⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

329809 is a deficient number, since it is larger than the sum of its proper divisors (10671).

329809 is a wasteful number, since it uses less digits than its factorization.

329809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10670.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 329809 is about 574.2899964304. The cubic root of 329809 is about 69.0908974964.

The spelling of 329809 in words is "three hundred twenty-nine thousand, eight hundred nine".