723820 has 12 divisors (see below), whose sum is σ = 1520064. Its totient is φ = 289520.

The previous prime is 723803. The next prime is 723823. The reversal of 723820 is 28327.

It is a happy number.

723820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 723791 and 723800.

It is not an unprimeable number, because it can be changed into a prime (723823) 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, 18076 + ... + 18115.

It is an arithmetic number, because the mean of its divisors is an integer number (126672).

2⁷²³⁸²⁰ is an apocalyptic number.

It is an amenable number.

723820 is an abundant number, since it is smaller than the sum of its proper divisors (796244).

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

723820 is a wasteful number, since it uses less digits than its factorization.

723820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36200 (or 36198 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 723820 is about 850.7761162609. The cubic root of 723820 is about 89.7863243742.

The spelling of 723820 in words is "seven hundred twenty-three thousand, eight hundred twenty".