866266 has 8 divisors (see below), whose sum is σ = 1307124. Its totient is φ = 430560.

The previous prime is 866231. The next prime is 866279. The reversal of 866266 is 662668.

It can be written as a sum of positive squares in 2 ways, for example, as 540225 + 326041 = 735^2 + 571^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 835 + ... + 1558.

2⁸⁶⁶²⁶⁶ is an apocalyptic number.

866266 is a deficient number, since it is larger than the sum of its proper divisors (440858).

866266 is a wasteful number, since it uses less digits than its factorization.

866266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its digits is 20736, while the sum is 34.

The square root of 866266 is about 930.7341188546. The cubic root of 866266 is about 95.3272554957.

The spelling of 866266 in words is "eight hundred sixty-six thousand, two hundred sixty-six".