862865 has 4 divisors (see below), whose sum is σ = 1035444. Its totient is φ = 690288.

The previous prime is 862861. The next prime is 862879. The reversal of 862865 is 568268.

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 274576 + 588289 = 524^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 862865 - 2² = 862861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (862861) 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, 86282 + ... + 86291.

It is an arithmetic number, because the mean of its divisors is an integer number (258861).

2⁸⁶²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

862865 is a deficient number, since it is larger than the sum of its proper divisors (172579).

862865 is a wasteful number, since it uses less digits than its factorization.

862865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172578.

The product of its digits is 23040, while the sum is 35.

The square root of 862865 is about 928.9052696589. The cubic root of 862865 is about 95.2023388193.

The spelling of 862865 in words is "eight hundred sixty-two thousand, eight hundred sixty-five".