723906 has 24 divisors (see below), whose sum is σ = 1585584. Its totient is φ = 238680.

The previous prime is 723901. The next prime is 723907. The reversal of 723906 is 609327.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 723906.

It is not an unprimeable number, because it can be changed into a prime (723901) by changing a digit.

723906 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 11 ways as a sum of consecutive naturals, for example, 2205 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (66066).

2⁷²³⁹⁰⁶ is an apocalyptic number.

723906 is an abundant number, since it is smaller than the sum of its proper divisors (861678).

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

723906 is a wasteful number, since it uses less digits than its factorization.

723906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 723906 is about 850.8266568462. The cubic root of 723906 is about 89.7898801929.

The spelling of 723906 in words is "seven hundred twenty-three thousand, nine hundred six".