865542 has 16 divisors (see below), whose sum is σ = 1742832. Its totient is φ = 286560.

The previous prime is 865537. The next prime is 865577. The reversal of 865542 is 245568.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

865542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2⁸⁶⁵⁵⁴² is an apocalyptic number.

865542 is an abundant number, since it is smaller than the sum of its proper divisors (877290).

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

865542 is a wasteful number, since it uses less digits than its factorization.

865542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

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

The square root of 865542 is about 930.3450972623. The cubic root of 865542 is about 95.3006908418.

The spelling of 865542 in words is "eight hundred sixty-five thousand, five hundred forty-two".