866441 has 4 divisors (see below), whose sum is σ = 874500. Its totient is φ = 858384.

The previous prime is 866431. The next prime is 866443. The reversal of 866441 is 144668.

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 511225 + 355216 = 715^2 + 596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (866443) 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, 3866 + ... + 4083.

It is an arithmetic number, because the mean of its divisors is an integer number (218625).

2⁸⁶⁶⁴⁴¹ is an apocalyptic number.

It is an amenable number.

866441 is a deficient number, since it is larger than the sum of its proper divisors (8059).

866441 is a wasteful number, since it uses less digits than its factorization.

866441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8058.

The product of its digits is 4608, while the sum is 29.

The square root of 866441 is about 930.8281259180. The cubic root of 866441 is about 95.3336742887. Note that the first 3 decimals are identical.

The spelling of 866441 in words is "eight hundred sixty-six thousand, four hundred forty-one".