99988999 has 8 divisors (see below), whose sum is σ = 109161360.
Its totient is φ = 90830400.
The previous prime is 99988997. The next prime is 99989003.
99988999 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 99988999 - 21 = 99988997 is a prime.
It is a zygodrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99988997) 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, 17139 + ... + 22219.
It is an arithmetic number, because the mean of its divisors is an integer number (13645170).
Almost surely, 299988999 is an apocalyptic number.
99988999 is a deficient number, since it is larger than the sum of its proper divisors (9172361).
99988999 is a wasteful number, since it uses less digits than its factorization.
99988999 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6881.
The product of its digits is 34012224, while the sum is 70.
The square root of 99988999 is about 9999.4499348714.
The cubic root of 99988999 is about 464.1418620308.
The spelling of 99988999 in words is "ninety-nine million, nine hundred eighty-eight thousand, nine hundred ninety-nine".