866124 has 54 divisors (see below), whose sum is σ = 2552004. Its totient is φ = 246960.

The previous prime is 866123. The next prime is 866161. The reversal of 866124 is 421668.

It is a zygodrome in base 3.

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 17 ways as a sum of consecutive naturals, for example, 1519 + ... + 2009.

2⁸⁶⁶¹²⁴ is an apocalyptic number.

866124 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276002).

866124 is an abundant number, since it is smaller than the sum of its proper divisors (1685880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866124 is a wasteful number, since it uses less digits than its factorization.

866124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 503 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 866124 is about 930.6578318587. The cubic root of 866124 is about 95.3220464683.

It can be divided in two parts, 866 and 124, that added together give a triangular number (990 = T₄₄).

The spelling of 866124 in words is "eight hundred sixty-six thousand, one hundred twenty-four".