835840 has 36 divisors (see below), whose sum is σ = 2005164. Its totient is φ = 333824.

The previous prime is 835831. The next prime is 835841. The reversal of 835840 is 48538.

It can be written as a sum of positive squares in 2 ways, for example, as 246016 + 589824 = 496^2 + 768^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 835799 and 835808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (835841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (55699).

2⁸³⁵⁸⁴⁰ is an apocalyptic number.

835840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 835840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002582).

835840 is an abundant number, since it is smaller than the sum of its proper divisors (1169324).

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

835840 is an equidigital number, since it uses as much as digits as its factorization.

835840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 835840 is about 914.2428561383. The cubic root of 835840 is about 94.1978629856.

The spelling of 835840 in words is "eight hundred thirty-five thousand, eight hundred forty".