856373 has 6 divisors (see below), whose sum is σ = 996246. Its totient is φ = 733992.

The previous prime is 856369. The next prime is 856381. The reversal of 856373 is 373658.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 550564 + 305809 = 742^2 + 553^2 .

It is not a de Polignac number, because 856373 - 2² = 856369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8690 + ... + 8787.

It is an arithmetic number, because the mean of its divisors is an integer number (166041).

2⁸⁵⁶³⁷³ is an apocalyptic number.

It is an amenable number.

856373 is a deficient number, since it is larger than the sum of its proper divisors (139873).

856373 is a wasteful number, since it uses less digits than its factorization.

856373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17491 (or 17484 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 856373 is about 925.4042359964. The cubic root of 856373 is about 94.9629772634.

The spelling of 856373 in words is "eight hundred fifty-six thousand, three hundred seventy-three".