856653 has 24 divisors (see below), whose sum is σ = 1389888. Its totient is φ = 459648.

The previous prime is 856649. The next prime is 856693. The reversal of 856653 is 356658.

It is not a de Polignac number, because 856653 - 2² = 856649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7525 + ... + 7637.

It is an arithmetic number, because the mean of its divisors is an integer number (57912).

2⁸⁵⁶⁶⁵³ is an apocalyptic number.

It is an amenable number.

856653 is a deficient number, since it is larger than the sum of its proper divisors (533235).

856653 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 856653 = (535686)₁₁.

856653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 142 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 856653 is about 925.5555088702. Note that the first 4 decimals coincide. The cubic root of 856653 is about 94.9733258444.

The spelling of 856653 in words is "eight hundred fifty-six thousand, six hundred fifty-three".