328959989 has 2 divisors, whose sum is σ = 328959990. Its totient is φ = 328959988.

The previous prime is 328959907. The next prime is 328959991. The reversal of 328959989 is 989959823.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259371025 + 69588964 = 16105^2 + 8342^2 .

It is a cyclic number.

It is not a de Polignac number, because 328959989 - 2²⁰ = 327911413 is a prime.

Together with 328959991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328959889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164479994 + 164479995.

It is an arithmetic number, because the mean of its divisors is an integer number (164479995).

Almost surely, 2^328959989 is an apocalyptic number.

It is an amenable number.

328959989 is a deficient number, since it is larger than the sum of its proper divisors (1).

328959989 is an equidigital number, since it uses as much as digits as its factorization.

328959989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 62.

The square root of 328959989 is about 18137.2541747642. The cubic root of 328959989 is about 690.3156079110.

The spelling of 328959989 in words is "three hundred twenty-eight million, nine hundred fifty-nine thousand, nine hundred eighty-nine".