810863 has 4 divisors (see below), whose sum is σ = 853560. Its totient is φ = 768168.

The previous prime is 810853. The next prime is 810871. The reversal of 810863 is 368018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 810863 - 2¹⁰ = 809839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21320 + ... + 21357.

It is an arithmetic number, because the mean of its divisors is an integer number (213390).

2⁸¹⁰⁸⁶³ is an apocalyptic number.

810863 is a deficient number, since it is larger than the sum of its proper divisors (42697).

810863 is a wasteful number, since it uses less digits than its factorization.

810863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42696.

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

The square root of 810863 is about 900.4793168086. The cubic root of 810863 is about 93.2500688809.

The spelling of 810863 in words is "eight hundred ten thousand, eight hundred sixty-three".