723404321 has 2 divisors, whose sum is σ = 723404322. Its totient is φ = 723404320.

The previous prime is 723404299. The next prime is 723404323. The reversal of 723404321 is 123404327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382632721 + 340771600 = 19561^2 + 18460^2 .

It is an emirp because it is prime and its reverse (123404327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723404321 is a prime.

Together with 723404323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (723404323) 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 as a sum of consecutive naturals, namely, 361702160 + 361702161.

It is an arithmetic number, because the mean of its divisors is an integer number (361702161).

Almost surely, 2^723404321 is an apocalyptic number.

It is an amenable number.

723404321 is a deficient number, since it is larger than the sum of its proper divisors (1).

723404321 is an equidigital number, since it uses as much as digits as its factorization.

723404321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 723404321 is about 26896.1766985570. The cubic root of 723404321 is about 897.6913343518.

Adding to 723404321 its reverse (123404327), we get a palindrome (846808648).

The spelling of 723404321 in words is "seven hundred twenty-three million, four hundred four thousand, three hundred twenty-one".