723920 has 20 divisors (see below), whose sum is σ = 1683300. Its totient is φ = 289536.

The previous prime is 723917. The next prime is 723923. The reversal of 723920 is 29327.

It is an interprime number because it is at equal distance from previous prime (723917) and next prime (723923).

It can be written as a sum of positive squares in 2 ways, for example, as 440896 + 283024 = 664^2 + 532^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4445 + ... + 4604.

It is an arithmetic number, because the mean of its divisors is an integer number (84165).

2⁷²³⁹²⁰ is an apocalyptic number.

It is an amenable number.

723920 is an abundant number, since it is smaller than the sum of its proper divisors (959380).

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

723920 is a wasteful number, since it uses less digits than its factorization.

723920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9062 (or 9056 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 723920 is about 850.8348840991. The cubic root of 723920 is about 89.7904590204.

The spelling of 723920 in words is "seven hundred twenty-three thousand, nine hundred twenty".