856923 has 4 divisors (see below), whose sum is σ = 1142568. Its totient is φ = 571280.

The previous prime is 856909. The next prime is 856927. The reversal of 856923 is 329658.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 856923 - 2⁹ = 856411 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (856927) 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 3 ways as a sum of consecutive naturals, for example, 142818 + ... + 142823.

It is an arithmetic number, because the mean of its divisors is an integer number (285642).

2⁸⁵⁶⁹²³ is an apocalyptic number.

856923 is a deficient number, since it is larger than the sum of its proper divisors (285645).

856923 is a wasteful number, since it uses less digits than its factorization.

856923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285644.

The product of its digits is 12960, while the sum is 33.

The square root of 856923 is about 925.7013557298. The cubic root of 856923 is about 94.9833026979.

The spelling of 856923 in words is "eight hundred fifty-six thousand, nine hundred twenty-three".