99999984 has 240 divisors, whose sum is σ = 331291296. Its totient is φ = 25804800.

The previous prime is 99999971. The next prime is 99999989. The reversal of 99999984 is 48999999.

It is a happy number.

Its product of digits (17006112) is a multiple of the sum of its prime factors (144).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1639314 + ... + 1639374.

Almost surely, 2^99999984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165645648).

99999984 is an abundant number, since it is smaller than the sum of its proper divisors (231291312).

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

99999984 is a wasteful number, since it uses less digits than its factorization.

99999984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 131 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 66.

The square root of 99999984 is about 9999.9992000000. Note that the first 3 decimals coincide. The cubic root of 99999984 is about 464.1588586061.

The spelling of 99999984 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-four".