99998899 has 32 divisors (see below), whose sum is σ = 135120384. Its totient is φ = 71470080.

The previous prime is 99998891. The next prime is 99998909. The reversal of 99998899 is 99889999.

It is not a de Polignac number, because 99998899 - 2³ = 99998891 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99998891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283107 + ... + 283459.

It is an arithmetic number, because the mean of its divisors is an integer number (4222512).

Almost surely, 2^99998899 is an apocalyptic number.

99998899 is a deficient number, since it is larger than the sum of its proper divisors (35121485).

99998899 is a wasteful number, since it uses less digits than its factorization.

99998899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 34012224, while the sum is 70.

The square root of 99998899 is about 9999.9449498485. The cubic root of 99998899 is about 464.1571798919.

Subtracting from 99998899 its reverse (99889999), we obtain a square (108900 = 330²).

The spelling of 99998899 in words is "ninety-nine million, nine hundred ninety-eight thousand, eight hundred ninety-nine".