813810 has 16 divisors (see below), whose sum is σ = 1953216. Its totient is φ = 217008.

The previous prime is 813797. The next prime is 813811. The reversal of 813810 is 18318.

It is a happy number.

It is a super-2 number, since 2×813810² = 1324573432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813811) by changing a digit.

813810 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, 13534 + ... + 13593.

It is an arithmetic number, because the mean of its divisors is an integer number (122076).

2⁸¹³⁸¹⁰ is an apocalyptic number.

813810 is an abundant number, since it is smaller than the sum of its proper divisors (1139406).

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

813810 is a wasteful number, since it uses less digits than its factorization.

813810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27137.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 813810 is about 902.1141834602. The cubic root of 813810 is about 93.3629016294.

The spelling of 813810 in words is "eight hundred thirteen thousand, eight hundred ten".