840879 has 12 divisors (see below), whose sum is σ = 1308216. Its totient is φ = 517392.

The previous prime is 840863. The next prime is 840907. The reversal of 840879 is 978048.

It is not a de Polignac number, because 840879 - 2⁴ = 840863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840839) 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, 3477 + ... + 3710.

It is an arithmetic number, because the mean of its divisors is an integer number (109018).

2⁸⁴⁰⁸⁷⁹ is an apocalyptic number.

840879 is a deficient number, since it is larger than the sum of its proper divisors (467337).

840879 is a wasteful number, since it uses less digits than its factorization.

840879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7206 (or 7203 counting only the distinct ones).

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

The square root of 840879 is about 916.9945474211. The cubic root of 840879 is about 94.3867796650.

The spelling of 840879 in words is "eight hundred forty thousand, eight hundred seventy-nine".