866534 has 4 divisors (see below), whose sum is σ = 1299804. Its totient is φ = 433266.

The previous prime is 866519. The next prime is 866573. The reversal of 866534 is 435668.

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

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 866534.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866534.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 216632 + ... + 216635.

It is an arithmetic number, because the mean of its divisors is an integer number (324951).

2⁸⁶⁶⁵³⁴ is an apocalyptic number.

866534 is a deficient number, since it is larger than the sum of its proper divisors (433270).

866534 is a wasteful number, since it uses less digits than its factorization.

866534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433269.

The product of its digits is 17280, while the sum is 32.

The square root of 866534 is about 930.8780800943. The cubic root of 866534 is about 95.3370850671.

The spelling of 866534 in words is "eight hundred sixty-six thousand, five hundred thirty-four".