842865 has 16 divisors (see below), whose sum is σ = 1366848. Its totient is φ = 443456.

The previous prime is 842857. The next prime is 842869. The reversal of 842865 is 568248.

It is a cyclic number.

It is not a de Polignac number, because 842865 - 2³ = 842857 is a prime.

Its product of digits (15360) is a multiple of the sum of its prime divisors (768).

It is a Curzon number.

842865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (842869) 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, 907 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (85428).

2⁸⁴²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

842865 is a deficient number, since it is larger than the sum of its proper divisors (523983).

842865 is a wasteful number, since it uses less digits than its factorization.

842865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its digits is 15360, while the sum is 33.

The square root of 842865 is about 918.0767941736. The cubic root of 842865 is about 94.4610292546.

The spelling of 842865 in words is "eight hundred forty-two thousand, eight hundred sixty-five".