856123 has 4 divisors (see below), whose sum is σ = 867040. Its totient is φ = 845208.

The previous prime is 856117. The next prime is 856133. The reversal of 856123 is 321658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321658 = 2 ⋅160829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856123 is a prime.

It is a super-2 number, since 2×856123² = 1465893182258, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁶ + 5⁶ + 1 + 6⁶ + 2⁸ + 3¹² .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856133) 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, 5340 + ... + 5497.

It is an arithmetic number, because the mean of its divisors is an integer number (216760).

2⁸⁵⁶¹²³ is an apocalyptic number.

856123 is a deficient number, since it is larger than the sum of its proper divisors (10917).

856123 is a wasteful number, since it uses less digits than its factorization.

856123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916.

The product of its digits is 1440, while the sum is 25.

The square root of 856123 is about 925.2691500315. The cubic root of 856123 is about 94.9537355525.

It can be divided in two parts, 856 and 123, that added together give a palindrome (979).

The spelling of 856123 in words is "eight hundred fifty-six thousand, one hundred twenty-three".