328814921 has 4 divisors (see below), whose sum is σ = 329731200. Its totient is φ = 327898644.

The previous prime is 328814909. The next prime is 328814929. The reversal of 328814921 is 129418823.

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: 129418823 = 19 ⋅6811517.

It is a cyclic number.

It is not a de Polignac number, because 328814921 - 2¹⁰ = 328813897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328814929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457601 + ... + 458318.

It is an arithmetic number, because the mean of its divisors is an integer number (82432800).

Almost surely, 2^328814921 is an apocalyptic number.

It is an amenable number.

328814921 is a deficient number, since it is larger than the sum of its proper divisors (916279).

328814921 is an equidigital number, since it uses as much as digits as its factorization.

328814921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916278.

The product of its digits is 27648, while the sum is 38.

The square root of 328814921 is about 18133.2545617162. The cubic root of 328814921 is about 690.2141189435.

The spelling of 328814921 in words is "three hundred twenty-eight million, eight hundred fourteen thousand, nine hundred twenty-one".