866923 has 4 divisors (see below), whose sum is σ = 887128. Its totient is φ = 846720.

The previous prime is 866917. The next prime is 866927. The reversal of 866923 is 329668.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866927) 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, 10038 + ... + 10123.

It is an arithmetic number, because the mean of its divisors is an integer number (221782).

2⁸⁶⁶⁹²³ is an apocalyptic number.

866923 is a deficient number, since it is larger than the sum of its proper divisors (20205).

866923 is a wasteful number, since it uses less digits than its factorization.

866923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20204.

The product of its digits is 15552, while the sum is 34.

The square root of 866923 is about 931.0869991574. The cubic root of 866923 is about 95.3513490113.

The spelling of 866923 in words is "eight hundred sixty-six thousand, nine hundred twenty-three".