328858921 has 4 divisors (see below), whose sum is σ = 328904644. Its totient is φ = 328813200.

The previous prime is 328858913. The next prime is 328858949. The reversal of 328858921 is 129858823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129858823 = 59 ⋅2200997.

It can be written as a sum of positive squares in 2 ways, for example, as 79566400 + 249292521 = 8920^2 + 15789^2 .

It is a cyclic number.

It is not a de Polignac number, because 328858921 - 2³ = 328858913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328858961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9450 + ... + 27331.

It is an arithmetic number, because the mean of its divisors is an integer number (82226161).

Almost surely, 2^328858921 is an apocalyptic number.

It is an amenable number.

328858921 is a deficient number, since it is larger than the sum of its proper divisors (45723).

328858921 is an equidigital number, since it uses as much as digits as its factorization.

328858921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45722.

The product of its digits is 276480, while the sum is 46.

The square root of 328858921 is about 18134.4677616962. The cubic root of 328858921 is about 690.2449043132.

The spelling of 328858921 in words is "three hundred twenty-eight million, eight hundred fifty-eight thousand, nine hundred twenty-one".