819899 has 2 divisors, whose sum is σ = 819900. Its totient is φ = 819898.

The previous prime is 819853. The next prime is 819911. The reversal of 819899 is 998918.

819899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819899 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (819829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409949 + 409950.

It is an arithmetic number, because the mean of its divisors is an integer number (409950).

2⁸¹⁹⁸⁹⁹ is an apocalyptic number.

819899 is a deficient number, since it is larger than the sum of its proper divisors (1).

819899 is an equidigital number, since it uses as much as digits as its factorization.

819899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 44.

The square root of 819899 is about 905.4827441757. The cubic root of 819899 is about 93.5951731872.

The spelling of 819899 in words is "eight hundred nineteen thousand, eight hundred ninety-nine".