865105 has 4 divisors (see below), whose sum is σ = 1038132. Its totient is φ = 692080.

The previous prime is 865103. The next prime is 865121. The reversal of 865105 is 501568.

865105 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 380689 + 484416 = 617^2 + 696^2 .

It is not a de Polignac number, because 865105 - 2¹ = 865103 is a prime.

It is a super-2 number, since 2×865105² = 1496813322050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865105.

It is not an unprimeable number, because it can be changed into a prime (865103) 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, 86506 + ... + 86515.

It is an arithmetic number, because the mean of its divisors is an integer number (259533).

2⁸⁶⁵¹⁰⁵ is an apocalyptic number.

It is an amenable number.

865105 is a deficient number, since it is larger than the sum of its proper divisors (173027).

865105 is a wasteful number, since it uses less digits than its factorization.

865105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173026.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 865105 is about 930.1102085237. The cubic root of 865105 is about 95.2846494817.

The spelling of 865105 in words is "eight hundred sixty-five thousand, one hundred five".