856557 has 12 divisors (see below), whose sum is σ = 1332604. Its totient is φ = 527040.

The previous prime is 856553. The next prime is 856567. The reversal of 856557 is 755658.

It can be written as a sum of positive squares in 2 ways, for example, as 35721 + 820836 = 189^2 + 906^2 .

It is not a de Polignac number, because 856557 - 2² = 856553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856553) 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 11 ways as a sum of consecutive naturals, for example, 3544 + ... + 3777.

2⁸⁵⁶⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

856557 is a deficient number, since it is larger than the sum of its proper divisors (476047).

856557 is a wasteful number, since it uses less digits than its factorization.

856557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7340 (or 7337 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 856557 is about 925.5036466703. The cubic root of 856557 is about 94.9697780136.

It can be divided in two parts, 8 and 56557, that added together give a palindrome (56565).

The spelling of 856557 in words is "eight hundred fifty-six thousand, five hundred fifty-seven".