999969998 has 8 divisors (see below), whose sum is σ = 1513973592. Its totient is φ = 495312136.

The previous prime is 999969991. The next prime is 999970003. The reversal of 999969998 is 899969999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999969991) 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 3 ways as a sum of consecutive naturals, for example, 2336165 + ... + 2336592.

It is an arithmetic number, because the mean of its divisors is an integer number (189246699).

Almost surely, 2^999969998 is an apocalyptic number.

999969998 is a deficient number, since it is larger than the sum of its proper divisors (514003594).

999969998 is a wasteful number, since it uses less digits than its factorization.

999969998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4672866.

The product of its digits is 229582512, while the sum is 77.

The square root of 999969998 is about 31622.3022248539. The cubic root of 999969998 is about 999.9899992333.

Subtracting from 999969998 its reverse (899969999), we obtain a palindrome (99999999).

It can be divided in two parts, 9999 and 69998, that added together give a palindrome (79997).

The spelling of 999969998 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, nine hundred ninety-eight".