723421 has 2 divisors, whose sum is σ = 723422. Its totient is φ = 723420.

The previous prime is 723413. The next prime is 723439. The reversal of 723421 is 124327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 105625 = 786^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 723421 - 2³ = 723413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361710 + 361711.

It is an arithmetic number, because the mean of its divisors is an integer number (361711).

2⁷²³⁴²¹ is an apocalyptic number.

It is an amenable number.

723421 is a deficient number, since it is larger than the sum of its proper divisors (1).

723421 is an equidigital number, since it uses as much as digits as its factorization.

723421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 19.

The square root of 723421 is about 850.5415921635. The cubic root of 723421 is about 89.7698233435.

Adding to 723421 its reverse (124327), we get a palindrome (847748).

The spelling of 723421 in words is "seven hundred twenty-three thousand, four hundred twenty-one", and thus it is an iban number.