99888999 has 12 divisors (see below), whose sum is σ = 154930104. Its totient is φ = 57079344.

The previous prime is 99888983. The next prime is 99889003. The reversal of 99888999 is 99988899.

It is not a de Polignac number, because 99888999 - 2⁴ = 99888983 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 (99888979) 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 11 ways as a sum of consecutive naturals, for example, 339612 + ... + 339905.

It is an arithmetic number, because the mean of its divisors is an integer number (12910842).

Almost surely, 2^99888999 is an apocalyptic number.

99888999 is a deficient number, since it is larger than the sum of its proper divisors (55041105).

99888999 is a wasteful number, since it uses less digits than its factorization.

99888999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679534 (or 679527 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 69.

The square root of 99888999 is about 9994.4484089919. The cubic root of 99888999 is about 463.9870794435.

The spelling of 99888999 in words is "ninety-nine million, eight hundred eighty-eight thousand, nine hundred ninety-nine".