723321 has 6 divisors (see below), whose sum is σ = 1044810. Its totient is φ = 482208.

The previous prime is 723319. The next prime is 723337. The reversal of 723321 is 123327.

723321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 114921 = 780^2 + 339^2 .

It is not a de Polignac number, because 723321 - 2¹ = 723319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 723294 and 723303.

It is not an unprimeable number, because it can be changed into a prime (723361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40176 + ... + 40193.

It is an arithmetic number, because the mean of its divisors is an integer number (174135).

2⁷²³³²¹ is an apocalyptic number.

It is an amenable number.

723321 is a deficient number, since it is larger than the sum of its proper divisors (321489).

723321 is a wasteful number, since it uses less digits than its factorization.

723321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80375 (or 80372 counting only the distinct ones).

The product of its digits is 252, while the sum is 18.

The square root of 723321 is about 850.4828040590. The cubic root of 723321 is about 89.7656867959.

Adding to 723321 its reverse (123327), we get a palindrome (846648).

The spelling of 723321 in words is "seven hundred twenty-three thousand, three hundred twenty-one", and thus it is an iban number.