856365 has 16 divisors (see below), whose sum is σ = 1408128. Its totient is φ = 444096.

The previous prime is 856351. The next prime is 856369. The reversal of 856365 is 563658.

It is not a de Polignac number, because 856365 - 2⁵ = 856333 is a prime.

It is a super-2 number, since 2×856365² = 1466722026450, which contains 22 as substring.

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

856365 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (88008).

2⁸⁵⁶³⁶⁵ is an apocalyptic number.

It is an amenable number.

856365 is a deficient number, since it is larger than the sum of its proper divisors (551763).

856365 is a wasteful number, since it uses less digits than its factorization.

856365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

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

The square root of 856365 is about 925.3999135509. The cubic root of 856365 is about 94.9626815565.

It can be divided in two parts, 856 and 365, that added together give a palindrome (1221).

The spelling of 856365 in words is "eight hundred fifty-six thousand, three hundred sixty-five".