723204 has 18 divisors (see below), whose sum is σ = 1828190. Its totient is φ = 241056.

The previous prime is 723193. The next prime is 723209. The reversal of 723204 is 402327.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 230400 = 702^2 + 480^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 723204.

It is not an unprimeable number, because it can be changed into a prime (723209) by changing a digit.

723204 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10009 + ... + 10080.

2⁷²³²⁰⁴ is an apocalyptic number.

It is an amenable number.

723204 is an abundant number, since it is smaller than the sum of its proper divisors (1104986).

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

723204 is a wasteful number, since it uses less digits than its factorization.

723204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20099 (or 20094 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 723204 is about 850.4140168177. The cubic root of 723204 is about 89.7608465513.

The spelling of 723204 in words is "seven hundred twenty-three thousand, two hundred four", and thus it is an iban number.