818899 has 4 divisors (see below), whose sum is σ = 823336. Its totient is φ = 814464.

The previous prime is 818897. The next prime is 818947. The reversal of 818899 is 998818.

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 818899 - 2¹ = 818897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1929 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (205834).

2⁸¹⁸⁸⁹⁹ is an apocalyptic number.

818899 is a deficient number, since it is larger than the sum of its proper divisors (4437).

818899 is a wasteful number, since it uses less digits than its factorization.

818899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436.

The product of its digits is 41472, while the sum is 43.

The square root of 818899 is about 904.9303840628. The cubic root of 818899 is about 93.5571062015.

The spelling of 818899 in words is "eight hundred eighteen thousand, eight hundred ninety-nine".