840085 has 16 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 616896.

The previous prime is 840083. The next prime is 840109. The reversal of 840085 is 580048.

840085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 840085 - 2¹ = 840083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3396 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (68400).

2⁸⁴⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

840085 is a deficient number, since it is larger than the sum of its proper divisors (254315).

840085 is a wasteful number, since it uses less digits than its factorization.

840085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 840085 is about 916.5615091198. The cubic root of 840085 is about 94.3570620703.

The spelling of 840085 in words is "eight hundred forty thousand, eighty-five".