328989 has 4 divisors (see below), whose sum is σ = 438656. Its totient is φ = 219324.

The previous prime is 328981. The next prime is 329009. The reversal of 328989 is 989823.

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: 989823 = 3 ⋅329941.

It is not a de Polignac number, because 328989 - 2³ = 328981 is a prime.

It is a D-number.

It is a Duffinian number.

328989 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 328989.

It is not an unprimeable number, because it can be changed into a prime (328981) 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, 54829 + ... + 54834.

It is an arithmetic number, because the mean of its divisors is an integer number (109664).

2³²⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

328989 is a deficient number, since it is larger than the sum of its proper divisors (109667).

328989 is a wasteful number, since it uses less digits than its factorization.

328989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109666.

The product of its digits is 31104, while the sum is 39.

The square root of 328989 is about 573.5756270972. The cubic root of 328989 is about 69.0335900305.

The spelling of 328989 in words is "three hundred twenty-eight thousand, nine hundred eighty-nine".