865385 has 8 divisors (see below), whose sum is σ = 1099656. Its totient is φ = 651520.

The previous prime is 865379. The next prime is 865409. The reversal of 865385 is 583568.

865385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 212521 + 652864 = 461^2 + 808^2 .

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

It is not a de Polignac number, because 865385 - 2⁶ = 865321 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865385.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5006 + ... + 5175.

It is an arithmetic number, because the mean of its divisors is an integer number (137457).

2⁸⁶⁵³⁸⁵ is an apocalyptic number.

865385 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

865385 is a deficient number, since it is larger than the sum of its proper divisors (234271).

865385 is a wasteful number, since it uses less digits than its factorization.

865385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203.

The product of its digits is 28800, while the sum is 35.

The square root of 865385 is about 930.2607161436. The cubic root of 865385 is about 95.2949283203.

The spelling of 865385 in words is "eight hundred sixty-five thousand, three hundred eighty-five".