866245 has 4 divisors (see below), whose sum is σ = 1039500. Its totient is φ = 692992.

The previous prime is 866231. The next prime is 866279. The reversal of 866245 is 542668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 229441 = 798^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 866245 - 2⁵ = 866213 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86620 + ... + 86629.

It is an arithmetic number, because the mean of its divisors is an integer number (259875).

2⁸⁶⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

866245 is a deficient number, since it is larger than the sum of its proper divisors (173255).

866245 is a wasteful number, since it uses less digits than its factorization.

866245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173254.

The product of its digits is 11520, while the sum is 31.

The square root of 866245 is about 930.7228373689. The cubic root of 866245 is about 95.3264851825.

It can be divided in two parts, 866 and 245, that added together give a palindrome (1111).

The spelling of 866245 in words is "eight hundred sixty-six thousand, two hundred forty-five".