856646 has 16 divisors (see below), whose sum is σ = 1503744. Its totient is φ = 358344.

The previous prime is 856637. The next prime is 856649. The reversal of 856646 is 646658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (93984).

2⁸⁵⁶⁶⁴⁶ is an apocalyptic number.

856646 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

856646 is a deficient number, since it is larger than the sum of its proper divisors (647098).

856646 is a wasteful number, since it uses less digits than its factorization.

856646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475.

The product of its digits is 34560, while the sum is 35.

The square root of 856646 is about 925.5517273497. The cubic root of 856646 is about 94.9730671574.

The spelling of 856646 in words is "eight hundred fifty-six thousand, six hundred forty-six".