999890098998 has 16 divisors (see below), whose sum is σ = 2285463083520. Its totient is φ = 285682885416.

The previous prime is 999890098993. The next prime is 999890099009. The reversal of 999890098998 is 899890098999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999890098993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11903453518 + ... + 11903453601.

It is an arithmetic number, because the mean of its divisors is an integer number (142841442720).

Almost surely, 2^999890098998 is an apocalyptic number.

999890098998 is an abundant number, since it is smaller than the sum of its proper divisors (1285572984522).

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

999890098998 is a wasteful number, since it uses less digits than its factorization.

999890098998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23806907131.

The product of its (nonzero) digits is 2448880128, while the sum is 87.

Subtracting from 999890098998 its reverse (899890098999), we obtain a palindrome (99999999999).

The spelling of 999890098998 in words is "nine hundred ninety-nine billion, eight hundred ninety million, ninety-eight thousand, nine hundred ninety-eight".