866042 has 16 divisors (see below), whose sum is σ = 1380672. Its totient is φ = 406560.

The previous prime is 866029. The next prime is 866051. The reversal of 866042 is 240668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2942 + ... + 3222.

It is an arithmetic number, because the mean of its divisors is an integer number (86292).

2⁸⁶⁶⁰⁴² is an apocalyptic number.

866042 is a deficient number, since it is larger than the sum of its proper divisors (514630).

866042 is a wasteful number, since it uses less digits than its factorization.

866042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 866042 is about 930.6137759565. The cubic root of 866042 is about 95.3190381791.

The spelling of 866042 in words is "eight hundred sixty-six thousand, forty-two".