842840 has 32 divisors (see below), whose sum is σ = 1998000. Its totient is φ = 319104.

The previous prime is 842819. The next prime is 842857. The reversal of 842840 is 48248.

842840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206 + ... + 1314.

2⁸⁴²⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999000).

842840 is an abundant number, since it is smaller than the sum of its proper divisors (1155160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

842840 is a wasteful number, since it uses less digits than its factorization.

842840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 842840 is about 918.0631786538. The cubic root of 842840 is about 94.4600953173.

The spelling of 842840 in words is "eight hundred forty-two thousand, eight hundred forty".