999898999 has 8 divisors (see below), whose sum is σ = 1097106192. Its totient is φ = 903743040.

The previous prime is 999898981. The next prime is 999899003.

999898999 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 999898999 - 2¹⁷ = 999767927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999898969) 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, 260814 + ... + 264619.

It is an arithmetic number, because the mean of its divisors is an integer number (137138274).

Almost surely, 2^999898999 is an apocalyptic number.

999898999 is a deficient number, since it is larger than the sum of its proper divisors (97207193).

999898999 is a wasteful number, since it uses less digits than its factorization.

999898999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525617.

The product of its digits is 306110016, while the sum is 79.

The square root of 999898999 is about 31621.1795953282. The cubic root of 999898999 is about 999.9663318665.

It can be divided in two parts, 999 and 898999, that added together give a palindrome (899998).

The spelling of 999898999 in words is "nine hundred ninety-nine million, eight hundred ninety-eight thousand, nine hundred ninety-nine".