835640 has 32 divisors (see below), whose sum is σ = 2026080. Its totient is φ = 308352.

The previous prime is 835633. The next prime is 835643. The reversal of 835640 is 46538.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (835643) by changing a digit.

835640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (63315).

2⁸³⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

835640 is an abundant number, since it is smaller than the sum of its proper divisors (1190440).

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

835640 is a wasteful number, since it uses less digits than its factorization.

835640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 835640 is about 914.1334694671. The cubic root of 835640 is about 94.1903491570.

The spelling of 835640 in words is "eight hundred thirty-five thousand, six hundred forty".