865942 has 16 divisors (see below), whose sum is σ = 1619712. Its totient is φ = 337320.

The previous prime is 865937. The next prime is 865957. The reversal of 865942 is 249568.

It is a happy number.

It is a d-powerful number, because it can be written as 8 + 6⁴ + 9² + 5⁷ + 4⁹ + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 865898 and 865907.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2658 + ... + 2965.

It is an arithmetic number, because the mean of its divisors is an integer number (101232).

2⁸⁶⁵⁹⁴² is an apocalyptic number.

865942 is a deficient number, since it is larger than the sum of its proper divisors (753770).

865942 is a wasteful number, since it uses less digits than its factorization.

865942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643.

The product of its digits is 17280, while the sum is 34.

The square root of 865942 is about 930.5600464237. The cubic root of 865942 is about 95.3153692767.

The spelling of 865942 in words is "eight hundred sixty-five thousand, nine hundred forty-two".