866455 has 4 divisors (see below), whose sum is σ = 1039752. Its totient is φ = 693160.

The previous prime is 866443. The next prime is 866461. The reversal of 866455 is 554668.

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

It is not a de Polignac number, because 866455 - 2¹¹ = 864407 is a prime.

It is a Duffinian number.

866455 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 866455.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 86641 + ... + 86650.

It is an arithmetic number, because the mean of its divisors is an integer number (259938).

2⁸⁶⁶⁴⁵⁵ is an apocalyptic number.

866455 is a deficient number, since it is larger than the sum of its proper divisors (173297).

866455 is a wasteful number, since it uses less digits than its factorization.

866455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173296.

The product of its digits is 28800, while the sum is 34.

The square root of 866455 is about 930.8356460729. The cubic root of 866455 is about 95.3341877549.

The spelling of 866455 in words is "eight hundred sixty-six thousand, four hundred fifty-five".