809998 has 16 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 339480.

The previous prime is 809993. The next prime is 810013. The reversal of 809998 is 899908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2⁸⁰⁹⁹⁹⁸ is an apocalyptic number.

809998 is a deficient number, since it is larger than the sum of its proper divisors (609266).

809998 is a wasteful number, since it uses less digits than its factorization.

809998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 809998 is about 899.9988888882. The cubic root of 809998 is about 93.2168984568.

The spelling of 809998 in words is "eight hundred nine thousand, nine hundred ninety-eight".