856881 has 12 divisors (see below), whose sum is σ = 1303120. Its totient is φ = 541080.

The previous prime is 856853. The next prime is 856897. The reversal of 856881 is 188658.

It is not a de Polignac number, because 856881 - 2⁹ = 856369 is a prime.

It is a super-3 number, since 3×856881³ = 1887481893339737523, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (856811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2335 + ... + 2676.

2⁸⁵⁶⁸⁸¹ is an apocalyptic number.

It is an amenable number.

856881 is a deficient number, since it is larger than the sum of its proper divisors (446239).

856881 is a wasteful number, since it uses less digits than its factorization.

856881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036 (or 5033 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 856881 is about 925.6786699498. The cubic root of 856881 is about 94.9817508806.

It can be divided in two parts, 8568 and 81, that added together give a square (8649 = 93²).

The spelling of 856881 in words is "eight hundred fifty-six thousand, eight hundred eighty-one".