999929998 has 16 divisors (see below), whose sum is σ = 1536581376. Its totient is φ = 487763640.

The previous prime is 999929989. The next prime is 999930023. The reversal of 999929998 is 899929999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 999929998.

It is a congruent number.

It is an unprimeable number.

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, 71965 + ... + 84727.

It is an arithmetic number, because the mean of its divisors is an integer number (96036336).

Almost surely, 2^999929998 is an apocalyptic number.

999929998 is a deficient number, since it is larger than the sum of its proper divisors (536651378).

999929998 is a wasteful number, since it uses less digits than its factorization.

999929998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13719.

The product of its digits is 76527504, while the sum is 73.

The square root of 999929998 is about 31621.6697535092. The cubic root of 999929998 is about 999.9766654555.

Subtracting from 999929998 its reverse (899929999), we obtain a palindrome (99999999).

The spelling of 999929998 in words is "nine hundred ninety-nine million, nine hundred twenty-nine thousand, nine hundred ninety-eight".