864005 has 4 divisors (see below), whose sum is σ = 1036812. Its totient is φ = 691200.

The previous prime is 863983. The next prime is 864007. The reversal of 864005 is 500468.

864005 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 649636 + 214369 = 806^2 + 463^2 .

It is not a de Polignac number, because 864005 - 2⁸ = 863749 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864007) 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, 86396 + ... + 86405.

It is an arithmetic number, because the mean of its divisors is an integer number (259203).

2⁸⁶⁴⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

864005 is a deficient number, since it is larger than the sum of its proper divisors (172807).

864005 is a wasteful number, since it uses less digits than its factorization.

864005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172806.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 864005 is about 929.5186926577. The cubic root of 864005 is about 95.2442468447.

The spelling of 864005 in words is "eight hundred sixty-four thousand, five".