723865 has 4 divisors (see below), whose sum is σ = 868644. Its totient is φ = 579088.

The previous prime is 723859. The next prime is 723893. The reversal of 723865 is 568327.

723865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 405769 = 564^2 + 637^2 .

It is a cyclic number.

It is not a de Polignac number, because 723865 - 2³ = 723857 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72382 + ... + 72391.

It is an arithmetic number, because the mean of its divisors is an integer number (217161).

2⁷²³⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

723865 is a deficient number, since it is larger than the sum of its proper divisors (144779).

723865 is a wasteful number, since it uses less digits than its factorization.

723865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144778.

The product of its digits is 10080, while the sum is 31.

The square root of 723865 is about 850.8025622905. The cubic root of 723865 is about 89.7881850121.

The spelling of 723865 in words is "seven hundred twenty-three thousand, eight hundred sixty-five".