999949998 has 8 divisors (see below), whose sum is σ = 1999900008. Its totient is φ = 333316664.

The previous prime is 999949997. The next prime is 999950033. The reversal of 999949998 is 899949999.

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

999949998 is an admirable 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 (999949997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83329161 + ... + 83329172.

It is an arithmetic number, because the mean of its divisors is an integer number (249987501).

Almost surely, 2^999949998 is an apocalyptic number.

999949998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999949998 is a wasteful number, since it uses less digits than its factorization.

999949998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166658338.

The product of its digits is 153055008, while the sum is 75.

The square root of 999949998 is about 31621.9859907628. The cubic root of 999949998 is about 999.9833323889.

Subtracting from 999949998 its reverse (899949999), we obtain a palindrome (99999999).

The spelling of 999949998 in words is "nine hundred ninety-nine million, nine hundred forty-nine thousand, nine hundred ninety-eight".