840791 has 6 divisors (see below), whose sum is σ = 978120. Its totient is φ = 720636.

The previous prime is 840767. The next prime is 840817. The reversal of 840791 is 197048.

It is not a de Polignac number, because 840791 - 2⁶ = 840727 is a prime.

It is a Duffinian 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 (840761) 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 5 ways as a sum of consecutive naturals, for example, 8531 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (163020).

2⁸⁴⁰⁷⁹¹ is an apocalyptic number.

840791 is a deficient number, since it is larger than the sum of its proper divisors (137329).

840791 is a wasteful number, since it uses less digits than its factorization.

840791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17173 (or 17166 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 840791 is about 916.9465633285. The cubic root of 840791 is about 94.3834869493.

The spelling of 840791 in words is "eight hundred forty thousand, seven hundred ninety-one".