866215 has 8 divisors (see below), whose sum is σ = 1188000. Its totient is φ = 593952.

The previous prime is 866213. The next prime is 866221. The reversal of 866215 is 512668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866215 - 2¹ = 866213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12340 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (148500).

2⁸⁶⁶²¹⁵ is an apocalyptic number.

866215 is a deficient number, since it is larger than the sum of its proper divisors (321785).

866215 is a wasteful number, since it uses less digits than its factorization.

866215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24761.

The product of its digits is 2880, while the sum is 28.

The square root of 866215 is about 930.7067207236. The cubic root of 866215 is about 95.3253847134.

It can be divided in two parts, 866 and 215, that added together give a triangular number (1081 = T₄₆).

The spelling of 866215 in words is "eight hundred sixty-six thousand, two hundred fifteen".