866723 has 24 divisors (see below), whose sum is σ = 1117200. Its totient is φ = 665280.

The previous prime is 866717. The next prime is 866737. The reversal of 866723 is 327668.

It is not a de Polignac number, because 866723 - 2⁴ = 866707 is a prime.

Its product of digits (12096) is a multiple of the sum of its prime divisors (72).

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 866723.

It is not an unprimeable number, because it can be changed into a prime (866713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29873 + ... + 29901.

It is an arithmetic number, because the mean of its divisors is an integer number (46550).

2⁸⁶⁶⁷²³ is an apocalyptic number.

866723 is a deficient number, since it is larger than the sum of its proper divisors (250477).

866723 is a wasteful number, since it uses less digits than its factorization.

866723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 72 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 866723 is about 930.9795916130. The cubic root of 866723 is about 95.3440158969.

The spelling of 866723 in words is "eight hundred sixty-six thousand, seven hundred twenty-three".