328391 has 8 divisors (see below), whose sum is σ = 384384. Its totient is φ = 274680.

The previous prime is 328381. The next prime is 328397. The reversal of 328391 is 193823.

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

It is not a de Polignac number, because 328391 - 2⁶ = 328327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 328391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328397) 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, 245 + ... + 846.

It is an arithmetic number, because the mean of its divisors is an integer number (48048).

2³²⁸³⁹¹ is an apocalyptic number.

328391 is a deficient number, since it is larger than the sum of its proper divisors (55993).

328391 is a wasteful number, since it uses less digits than its factorization.

328391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141.

The product of its digits is 1296, while the sum is 26.

The square root of 328391 is about 573.0540986678. The cubic root of 328391 is about 68.9917374409.

The spelling of 328391 in words is "three hundred twenty-eight thousand, three hundred ninety-one".