840834 has 32 divisors (see below), whose sum is σ = 1952640. Its totient is φ = 267696.

The previous prime is 840823. The next prime is 840839. The reversal of 840834 is 438048.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 840798 and 840807.

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 15 ways as a sum of consecutive naturals, for example, 904 + ... + 1580.

It is an arithmetic number, because the mean of its divisors is an integer number (61020).

2⁸⁴⁰⁸³⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976320).

840834 is an abundant number, since it is smaller than the sum of its proper divisors (1111806).

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

840834 is a wasteful number, since it uses less digits than its factorization.

840834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 840834 is about 916.9700104147. The cubic root of 840834 is about 94.3850959186.

The spelling of 840834 in words is "eight hundred forty thousand, eight hundred thirty-four".