999838 has 16 divisors (see below), whose sum is σ = 1815264. Its totient is φ = 403200.

The previous prime is 999809. The next prime is 999853. The reversal of 999838 is 838999.

It is a congruent number.

It is an unprimeable number.

999838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1863 + ... + 2338.

It is an arithmetic number, because the mean of its divisors is an integer number (113454).

2⁹⁹⁹⁸³⁸ is an apocalyptic number.

999838 is a deficient number, since it is larger than the sum of its proper divisors (815426).

999838 is a wasteful number, since it uses less digits than its factorization.

999838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4227.

The product of its digits is 139968, while the sum is 46.

The square root of 999838 is about 999.9189967192. The cubic root of 999838 is about 99.9945997084.

The spelling of 999838 in words is "nine hundred ninety-nine thousand, eight hundred thirty-eight".