999000998 has 16 divisors (see below), whose sum is σ = 1601794656. Its totient is φ = 466128960.

The previous prime is 999000991. The next prime is 999001007. The reversal of 999000998 is 899000999.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999000991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262961 + ... + 266732.

It is an arithmetic number, because the mean of its divisors is an integer number (100112166).

Almost surely, 2^999000998 is an apocalyptic number.

999000998 is a deficient number, since it is larger than the sum of its proper divisors (602793658).

999000998 is a wasteful number, since it uses less digits than its factorization.

999000998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529759.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 999000998 is about 31606.9770462156. The cubic root of 999000998 is about 999.6668883823. Note that the first 3 decimals are identical.

Subtracting from 999000998 its reverse (899000999), we obtain a palindrome (99999999).

The spelling of 999000998 in words is "nine hundred ninety-nine million, nine hundred ninety-eight", and thus it is an aban number.