730321 has 2 divisors, whose sum is σ = 730322. Its totient is φ = 730320.

The previous prime is 730297. The next prime is 730339. The reversal of 730321 is 123037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 190096 = 735^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 730321 - 2¹⁵ = 697553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 730295 and 730304.

It is not a weakly prime, because it can be changed into another prime (730021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365160 + 365161.

It is an arithmetic number, because the mean of its divisors is an integer number (365161).

2⁷³⁰³²¹ is an apocalyptic number.

It is an amenable number.

730321 is a deficient number, since it is larger than the sum of its proper divisors (1).

730321 is an equidigital number, since it uses as much as digits as its factorization.

730321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 730321 is about 854.5882049268. The cubic root of 730321 is about 90.0543293369.

Adding to 730321 its reverse (123037), we get a palindrome (853358).

The spelling of 730321 in words is "seven hundred thirty thousand, three hundred twenty-one".