866123 has 2 divisors, whose sum is σ = 866124. Its totient is φ = 866122.

The previous prime is 866119. The next prime is 866161. The reversal of 866123 is 321668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866123 - 2² = 866119 is a prime.

It is a super-2 number, since 2×866123² = 1500338102258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866092 and 866101.

It is not a weakly prime, because it can be changed into another prime (866183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433061 + 433062.

It is an arithmetic number, because the mean of its divisors is an integer number (433062).

2⁸⁶⁶¹²³ is an apocalyptic number.

866123 is a deficient number, since it is larger than the sum of its proper divisors (1).

866123 is an equidigital number, since it uses as much as digits as its factorization.

866123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 866123 is about 930.6572946042. The cubic root of 866123 is about 95.3220097830.

It can be divided in two parts, 866 and 123, that added together give a palindrome (989).

The spelling of 866123 in words is "eight hundred sixty-six thousand, one hundred twenty-three".