999998999898 has 16 divisors (see below), whose sum is σ = 2000111404320. Its totient is φ = 333314099216.

The previous prime is 999998999887. The next prime is 999998999899. The reversal of 999998999898 is 898999899999.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 999998999796 and 999998999805.

It is not an unprimeable number, because it can be changed into a prime (999998999899) 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, 4610340 + ... + 4822367.

It is an arithmetic number, because the mean of its divisors is an integer number (125006962770).

Almost surely, 2^999998999898 is an apocalyptic number.

999998999898 is an abundant number, since it is smaller than the sum of its proper divisors (1000112404422).

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

999998999898 is a wasteful number, since it uses less digits than its factorization.

999998999898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9450381.

The product of its digits is 198359290368, while the sum is 105.

The spelling of 999998999898 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, eight hundred ninety-eight".