866459 has 8 divisors (see below), whose sum is σ = 952128. Its totient is φ = 781960.

The previous prime is 866443. The next prime is 866461. The reversal of 866459 is 954668.

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

It is a cyclic number.

It is not a de Polignac number, because 866459 - 2⁴ = 866443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 2670.

It is an arithmetic number, because the mean of its divisors is an integer number (119016).

2⁸⁶⁶⁴⁵⁹ is an apocalyptic number.

866459 is a deficient number, since it is larger than the sum of its proper divisors (85669).

866459 is a wasteful number, since it uses less digits than its factorization.

866459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585.

The product of its digits is 51840, while the sum is 38.

The square root of 866459 is about 930.8377946775. The cubic root of 866459 is about 95.3343344584.

Subtracting 866459 from its reverse (954668), we obtain a square (88209 = 297²).

The spelling of 866459 in words is "eight hundred sixty-six thousand, four hundred fifty-nine".