810899 has 4 divisors (see below), whose sum is σ = 813120. Its totient is φ = 808680.

The previous prime is 810893. The next prime is 810907. The reversal of 810899 is 998018.

It is a happy number.

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 810899 - 2⁸ = 810643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810893) 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, 419 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (203280).

2⁸¹⁰⁸⁹⁹ is an apocalyptic number.

810899 is a deficient number, since it is larger than the sum of its proper divisors (2221).

810899 is a wasteful number, since it uses less digits than its factorization.

810899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 810899 is about 900.4993059409. The cubic root of 810899 is about 93.2514488726.

The spelling of 810899 in words is "eight hundred ten thousand, eight hundred ninety-nine".