868605 has 16 divisors (see below), whose sum is σ = 1409280. Its totient is φ = 456768.

The previous prime is 868603. The next prime is 868613. The reversal of 868605 is 506868.

It is not a de Polignac number, because 868605 - 2¹ = 868603 is a prime.

868605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (88080).

2⁸⁶⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

868605 is a deficient number, since it is larger than the sum of its proper divisors (540675).

868605 is a wasteful number, since it uses less digits than its factorization.

868605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 868605 is about 931.9898068112. The cubic root of 868605 is about 95.4129759213.

The spelling of 868605 in words is "eight hundred sixty-eight thousand, six hundred five".