723220 has 12 divisors (see below), whose sum is σ = 1518804. Its totient is φ = 289280.

The previous prime is 723209. The next prime is 723221. The reversal of 723220 is 22327.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 425104 + 298116 = 652^2 + 546^2 .

It is a junction number, because it is equal to n+sod(n) for n = 723194 and 723203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18061 + ... + 18100.

It is an arithmetic number, because the mean of its divisors is an integer number (126567).

2⁷²³²²⁰ is an apocalyptic number.

It is an amenable number.

723220 is an abundant number, since it is smaller than the sum of its proper divisors (795584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723220 is a wasteful number, since it uses less digits than its factorization.

723220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36170 (or 36168 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 723220 is about 850.4234239483. The cubic root of 723220 is about 89.7615084960.

Adding to 723220 its reverse (22327), we get a palindrome (745547).

The spelling of 723220 in words is "seven hundred twenty-three thousand, two hundred twenty", and thus it is an iban number.