864845 has 4 divisors (see below), whose sum is σ = 1037820. Its totient is φ = 691872.

The previous prime is 864817. The next prime is 864883. The reversal of 864845 is 548468.

864845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 121801 + 743044 = 349^2 + 862^2 .

It is a cyclic number.

It is not a de Polignac number, because 864845 - 2⁶ = 864781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86480 + ... + 86489.

It is an arithmetic number, because the mean of its divisors is an integer number (259455).

2⁸⁶⁴⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

864845 is a deficient number, since it is larger than the sum of its proper divisors (172975).

864845 is a wasteful number, since it uses less digits than its factorization.

864845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172974.

The product of its digits is 30720, while the sum is 35.

The square root of 864845 is about 929.9704296374. The cubic root of 864845 is about 95.2751028598.

The spelling of 864845 in words is "eight hundred sixty-four thousand, eight hundred forty-five".