810889 has 4 divisors (see below), whose sum is σ = 814660. Its totient is φ = 807120.

The previous prime is 810881. The next prime is 810893. The reversal of 810889 is 988018.

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

It can be written as a sum of positive squares in 2 ways, for example, as 577600 + 233289 = 760^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 810889 - 2³ = 810881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1542 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (203665).

2⁸¹⁰⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

810889 is a deficient number, since it is larger than the sum of its proper divisors (3771).

810889 is a wasteful number, since it uses less digits than its factorization.

810889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 810889 is about 900.4937534486. The cubic root of 810889 is about 93.2510655457.

The spelling of 810889 in words is "eight hundred ten thousand, eight hundred eighty-nine".