840889 has 9 divisors (see below), whose sum is σ = 985701. Its totient is φ = 715260.

The previous prime is 840863. The next prime is 840907. The reversal of 840889 is 988048.

The square root of 840889 is 917.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 840889 - 2⁷ = 840761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840839) 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 8 ways as a sum of consecutive naturals, for example, 6354 + ... + 6484.

2⁸⁴⁰⁸⁸⁹ is an apocalyptic number.

840889 is the 917-th square number.

840889 is the 459-th centered octagonal number.

It is an amenable number.

840889 is a deficient number, since it is larger than the sum of its proper divisors (144812).

840889 is an equidigital number, since it uses as much as digits as its factorization.

840889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The cubic root of 840889 is about 94.3871538227.

The spelling of 840889 in words is "eight hundred forty thousand, eight hundred eighty-nine".