999959898 has 32 divisors (see below), whose sum is σ = 2287359360. Its totient is φ = 285485760.

The previous prime is 999959897. The next prime is 999959903. The reversal of 999959898 is 898959999.

It is not an unprimeable number, because it can be changed into a prime (999959897) 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 15 ways as a sum of consecutive naturals, for example, 51688 + ... + 68348.

It is an arithmetic number, because the mean of its divisors is an integer number (71479980).

Almost surely, 2^999959898 is an apocalyptic number.

999959898 is an abundant number, since it is smaller than the sum of its proper divisors (1287399462).

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

999959898 is a wasteful number, since it uses less digits than its factorization.

999959898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18102.

The product of its digits is 170061120, while the sum is 75.

The square root of 999959898 is about 31622.1425270332. The cubic root of 999959898 is about 999.9866324880.

The spelling of 999959898 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, eight hundred ninety-eight".