866138 has 16 divisors (see below), whose sum is σ = 1599360. Its totient is φ = 342576.

The previous prime is 866123. The next prime is 866161. The reversal of 866138 is 831668.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

866138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2198 + ... + 2561.

It is an arithmetic number, because the mean of its divisors is an integer number (99960).

2⁸⁶⁶¹³⁸ is an apocalyptic number.

866138 is a deficient number, since it is larger than the sum of its proper divisors (733222).

866138 is a wasteful number, since it uses less digits than its factorization.

866138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781.

The product of its digits is 6912, while the sum is 32.

The square root of 866138 is about 930.6653533897. The cubic root of 866138 is about 95.3225600597.

The spelling of 866138 in words is "eight hundred sixty-six thousand, one hundred thirty-eight".