985891 has 6 divisors (see below), whose sum is σ = 1040892. Its totient is φ = 933660.

The previous prime is 985877. The next prime is 985903. The reversal of 985891 is 198589.

985891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 985891 - 2⁹ = 985379 is a prime.

It is a Duffinian number.

985891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (985871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005 + ... + 1726.

It is an arithmetic number, because the mean of its divisors is an integer number (173482).

2⁹⁸⁵⁸⁹¹ is an apocalyptic number.

985891 is a deficient number, since it is larger than the sum of its proper divisors (55001).

985891 is a wasteful number, since it uses less digits than its factorization.

985891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769 (or 2750 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The square root of 985891 is about 992.9204399145. The cubic root of 985891 is about 99.5274706773.

The spelling of 985891 in words is "nine hundred eighty-five thousand, eight hundred ninety-one".