866129 has 8 divisors (see below), whose sum is σ = 959040. Its totient is φ = 775600.

The previous prime is 866123. The next prime is 866161. The reversal of 866129 is 921668.

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

It is a cyclic number.

It is not a de Polignac number, because 866129 - 2¹² = 862033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866095 and 866104.

It is not an unprimeable number, because it can be changed into a prime (866123) 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 7 ways as a sum of consecutive naturals, for example, 227 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (119880).

2⁸⁶⁶¹²⁹ is an apocalyptic number.

It is an amenable number.

866129 is a deficient number, since it is larger than the sum of its proper divisors (92911).

866129 is a wasteful number, since it uses less digits than its factorization.

866129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191.

The product of its digits is 5184, while the sum is 32.

The square root of 866129 is about 930.6605181268. The cubic root of 866129 is about 95.3222298945.

The spelling of 866129 in words is "eight hundred sixty-six thousand, one hundred twenty-nine".