840885 has 16 divisors (see below), whose sum is σ = 1368960. Its totient is φ = 440640.

The previous prime is 840863. The next prime is 840907. The reversal of 840885 is 588048.

It is an interprime number because it is at equal distance from previous prime (840863) and next prime (840907).

It is not a de Polignac number, because 840885 - 2⁶ = 840821 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 456 + ... + 1374.

It is an arithmetic number, because the mean of its divisors is an integer number (85560).

2⁸⁴⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

840885 is a deficient number, since it is larger than the sum of its proper divisors (528075).

840885 is a wasteful number, since it uses less digits than its factorization.

840885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 840885 is about 916.9978189723. The cubic root of 840885 is about 94.3870041599.

The spelling of 840885 in words is "eight hundred forty thousand, eight hundred eighty-five".