866224 has 10 divisors (see below), whose sum is σ = 1678340. Its totient is φ = 433104.

The previous prime is 866221. The next prime is 866231. The reversal of 866224 is 422668.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 866192 and 866201.

It is not an unprimeable number, because it can be changed into a prime (866221) 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 as a sum of consecutive naturals, namely, 27054 + ... + 27085.

It is an arithmetic number, because the mean of its divisors is an integer number (167834).

2⁸⁶⁶²²⁴ is an apocalyptic number.

It is an amenable number.

866224 is a deficient number, since it is larger than the sum of its proper divisors (812116).

866224 is a wasteful number, since it uses less digits than its factorization.

866224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54147 (or 54141 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 866224 is about 930.7115557465. The cubic root of 866224 is about 95.3257148568.

Subtracting from 866224 its reverse (422668), we obtain a square (443556 = 666²).

The spelling of 866224 in words is "eight hundred sixty-six thousand, two hundred twenty-four".