810836 has 24 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 361440.

The previous prime is 810809. The next prime is 810839. The reversal of 810836 is 638018.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810839) by changing a digit.

810836 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1361 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (65856).

2⁸¹⁰⁸³⁶ is an apocalyptic number.

It is an amenable number.

810836 is a deficient number, since it is larger than the sum of its proper divisors (769708).

810836 is a wasteful number, since it uses less digits than its factorization.

810836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 810836 is about 900.4643246681. The cubic root of 810836 is about 93.2490338602.

The spelling of 810836 in words is "eight hundred ten thousand, eight hundred thirty-six".