891885 has 16 divisors (see below), whose sum is σ = 1466496. Its totient is φ = 462528.

The previous prime is 891859. The next prime is 891887. The reversal of 891885 is 588198.

It is not a de Polignac number, because 891885 - 2⁸ = 891629 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891885.

It is not an unprimeable number, because it can be changed into a prime (891887) 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, 249 + ... + 1358.

It is an arithmetic number, because the mean of its divisors is an integer number (91656).

2⁸⁹¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

891885 is a deficient number, since it is larger than the sum of its proper divisors (574611).

891885 is a wasteful number, since it uses less digits than its factorization.

891885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its digits is 23040, while the sum is 39.

The square root of 891885 is about 944.3966327767. The cubic root of 891885 is about 96.2578787051.

The spelling of 891885 in words is "eight hundred ninety-one thousand, eight hundred eighty-five".