866039 has 6 divisors (see below), whose sum is σ = 914400. Its totient is φ = 820116.

The previous prime is 866029. The next prime is 866051. The reversal of 866039 is 930668.

It is a happy number.

It is not a de Polignac number, because 866039 - 2⁸ = 865783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 865996 and 866014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 839 + ... + 1560.

It is an arithmetic number, because the mean of its divisors is an integer number (152400).

2⁸⁶⁶⁰³⁹ is an apocalyptic number.

866039 is a deficient number, since it is larger than the sum of its proper divisors (48361).

866039 is a wasteful number, since it uses less digits than its factorization.

866039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 866039 is about 930.6121641156. The cubic root of 866039 is about 95.3189281161.

The spelling of 866039 in words is "eight hundred sixty-six thousand, thirty-nine".