320004321 has 32 divisors (see below), whose sum is σ = 527294208. Its totient is φ = 168099840.

The previous prime is 320004319. The next prime is 320004337. The reversal of 320004321 is 123400023.

It is not a de Polignac number, because 320004321 - 2¹ = 320004319 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 320004321.

It is not an unprimeable number, because it can be changed into a prime (320004121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67881 + ... + 72441.

It is an arithmetic number, because the mean of its divisors is an integer number (16477944).

Almost surely, 2^320004321 is an apocalyptic number.

It is an amenable number.

320004321 is a deficient number, since it is larger than the sum of its proper divisors (207289887).

320004321 is a wasteful number, since it uses less digits than its factorization.

320004321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320004321 is about 17888.6645952122. The cubic root of 320004321 is about 683.9934573260.

Adding to 320004321 its reverse (123400023), we get a palindrome (443404344).

The spelling of 320004321 in words is "three hundred twenty million, four thousand, three hundred twenty-one".