864905 has 4 divisors (see below), whose sum is σ = 1037892. Its totient is φ = 691920.

The previous prime is 864901. The next prime is 864911. The reversal of 864905 is 509468.

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 258064 + 606841 = 508^2 + 779^2 .

It is not a de Polignac number, because 864905 - 2² = 864901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864901) 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, 86486 + ... + 86495.

It is an arithmetic number, because the mean of its divisors is an integer number (259473).

2⁸⁶⁴⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

864905 is a deficient number, since it is larger than the sum of its proper divisors (172987).

864905 is a wasteful number, since it uses less digits than its factorization.

864905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172986.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 864905 is about 930.0026881682. The cubic root of 864905 is about 95.2773060962.

The spelling of 864905 in words is "eight hundred sixty-four thousand, nine hundred five".