99989388 has 18 divisors (see below), whose sum is σ = 252751044. Its totient is φ = 33329784.

The previous prime is 99989369. The next prime is 99989389. The reversal of 99989388 is 88398999.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×99989388² = 19995755425229088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99989389) 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 5 ways as a sum of consecutive naturals, for example, 1388706 + ... + 1388777.

Almost surely, 2^99989388 is an apocalyptic number.

It is an amenable number.

99989388 is an abundant number, since it is smaller than the sum of its proper divisors (152761656).

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

99989388 is a wasteful number, since it uses less digits than its factorization.

99989388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777493 (or 2777488 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 63.

The square root of 99989388 is about 9999.4693859224. The cubic root of 99989388 is about 464.1424639336.

The spelling of 99989388 in words is "ninety-nine million, nine hundred eighty-nine thousand, three hundred eighty-eight".