866281 has 8 divisors (see below), whose sum is σ = 958664. Its totient is φ = 777600.

The previous prime is 866279. The next prime is 866293. The reversal of 866281 is 182668.

It can be written as a sum of positive squares in 4 ways, for example, as 40000 + 826281 = 200^2 + 909^2 .

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

It is a 5-Lehmer number, since φ(866281) divides (866281-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 866281 - 2¹ = 866279 is a prime.

It is a super-2 number, since 2×866281² = 1500885541922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (119833).

2⁸⁶⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

866281 is a deficient number, since it is larger than the sum of its proper divisors (92383).

866281 is a wasteful number, since it uses less digits than its factorization.

866281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

The product of its digits is 4608, while the sum is 31.

The square root of 866281 is about 930.7421769749. The cubic root of 866281 is about 95.3278057119.

The spelling of 866281 in words is "eight hundred sixty-six thousand, two hundred eighty-one".