856542 has 8 divisors (see below), whose sum is σ = 1713096. Its totient is φ = 285512.

The previous prime is 856529. The next prime is 856547. The reversal of 856542 is 245658.

It is a sphenic number, since it is the product of 3 distinct primes.

856542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856547) 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 3 ways as a sum of consecutive naturals, for example, 71373 + ... + 71384.

It is an arithmetic number, because the mean of its divisors is an integer number (214137).

2⁸⁵⁶⁵⁴² is an apocalyptic number.

856542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856542 is a wasteful number, since it uses less digits than its factorization.

856542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142762.

The product of its digits is 9600, while the sum is 30.

The square root of 856542 is about 925.4955429390. The cubic root of 856542 is about 94.9692236411.

The spelling of 856542 in words is "eight hundred fifty-six thousand, five hundred forty-two".