328309 has 4 divisors (see below), whose sum is σ = 339660. Its totient is φ = 316960.

The previous prime is 328303. The next prime is 328327. The reversal of 328309 is 903823.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903823 = 607 ⋅1489.

It can be written as a sum of positive squares in 2 ways, for example, as 88209 + 240100 = 297^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 328309 - 2⁵ = 328277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328303) 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, 5632 + ... + 5689.

It is an arithmetic number, because the mean of its divisors is an integer number (84915).

2³²⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

328309 is a deficient number, since it is larger than the sum of its proper divisors (11351).

328309 is a wasteful number, since it uses less digits than its factorization.

328309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11350.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 328309 is about 572.9825477272. The cubic root of 328309 is about 68.9859944969.

The spelling of 328309 in words is "three hundred twenty-eight thousand, three hundred nine".