866263 has 4 divisors (see below), whose sum is σ = 869608. Its totient is φ = 862920.

The previous prime is 866231. The next prime is 866279. The reversal of 866263 is 362668.

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

It is a cyclic number.

It is not a de Polignac number, because 866263 - 2⁵ = 866231 is a prime.

It is a Duffinian number.

866263 is a lucky number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (217402).

2⁸⁶⁶²⁶³ is an apocalyptic number.

866263 is a deficient number, since it is larger than the sum of its proper divisors (3345).

866263 is a wasteful number, since it uses less digits than its factorization.

866263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344.

The product of its digits is 10368, while the sum is 31.

The square root of 866263 is about 930.7325072221. The cubic root of 866263 is about 95.3271454517.

The spelling of 866263 in words is "eight hundred sixty-six thousand, two hundred sixty-three".