864895 has 8 divisors (see below), whose sum is σ = 1063440. Its totient is φ = 674880.

The previous prime is 864887. The next prime is 864901. The reversal of 864895 is 598468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 864895 - 2³ = 864887 is a prime.

It is a super-2 number, since 2×864895² = 1496086722050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (132930).

2⁸⁶⁴⁸⁹⁵ is an apocalyptic number.

864895 is a deficient number, since it is larger than the sum of its proper divisors (198545).

864895 is a wasteful number, since it uses less digits than its factorization.

864895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265.

The product of its digits is 69120, while the sum is 40.

The square root of 864895 is about 929.9973118241. The cubic root of 864895 is about 95.2769388972.

The spelling of 864895 in words is "eight hundred sixty-four thousand, eight hundred ninety-five".