866158 has 4 divisors (see below), whose sum is σ = 1299240. Its totient is φ = 433078.

The previous prime is 866123. The next prime is 866161. The reversal of 866158 is 851668.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 216538 + ... + 216541.

It is an arithmetic number, because the mean of its divisors is an integer number (324810).

2⁸⁶⁶¹⁵⁸ is an apocalyptic number.

866158 is a deficient number, since it is larger than the sum of its proper divisors (433082).

866158 is a wasteful number, since it uses less digits than its factorization.

866158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433081.

The product of its digits is 11520, while the sum is 34.

The square root of 866158 is about 930.6760983285. The cubic root of 866158 is about 95.3232937521.

It can be divided in two parts, 866 and 158, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 866158 in words is "eight hundred sixty-six thousand, one hundred fifty-eight".