320430321 has 6 divisors (see below), whose sum is σ = 462843810. Its totient is φ = 213620208.

The previous prime is 320430283. The next prime is 320430337. The reversal of 320430321 is 123034023.

It can be written as a sum of positive squares in only one way, i.e., 273439296 + 46991025 = 16536^2 + 6855^2 .

It is not a de Polignac number, because 320430321 - 2¹³ = 320422129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320430294 and 320430303.

It is not an unprimeable number, because it can be changed into a prime (320430391) 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 5 ways as a sum of consecutive naturals, for example, 17801676 + ... + 17801693.

It is an arithmetic number, because the mean of its divisors is an integer number (77140635).

Almost surely, 2^320430321 is an apocalyptic number.

It is an amenable number.

320430321 is a deficient number, since it is larger than the sum of its proper divisors (142413489).

320430321 is a wasteful number, since it uses less digits than its factorization.

320430321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35603375 (or 35603372 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 320430321 is about 17900.5676166986. The cubic root of 320430321 is about 684.2968407395.

Adding to 320430321 its reverse (123034023), we get a palindrome (443464344).

The spelling of 320430321 in words is "three hundred twenty million, four hundred thirty thousand, three hundred twenty-one".