840789 has 12 divisors (see below), whose sum is σ = 1227616. Its totient is φ = 554472.

The previous prime is 840767. The next prime is 840817. The reversal of 840789 is 987048.

840789 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 840789 - 2⁵ = 840757 is a prime.

It is a super-3 number, since 3×840789³ = 1783127173332267207, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

840789 is a lucky number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 474 + ... + 1380.

2⁸⁴⁰⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

840789 is a deficient number, since it is larger than the sum of its proper divisors (386827).

840789 is a wasteful number, since it uses less digits than its factorization.

840789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 840789 is about 916.9454727518. The cubic root of 840789 is about 94.3834121122.

The spelling of 840789 in words is "eight hundred forty thousand, seven hundred eighty-nine".