99979984 has 40 divisors (see below), whose sum is σ = 212173920. Its totient is φ = 45356928.

The previous prime is 99979981. The next prime is 99979993. The reversal of 99979984 is 48997999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99979981) 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, 8199 + ... + 16345.

It is an arithmetic number, because the mean of its divisors is an integer number (5304348).

Almost surely, 2^99979984 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 99979984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106086960).

99979984 is an abundant number, since it is smaller than the sum of its proper divisors (112193936).

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

99979984 is a wasteful number, since it uses less digits than its factorization.

99979984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8227 (or 8221 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 64.

The square root of 99979984 is about 9998.9991499150. Note that the first 3 decimals coincide. The cubic root of 99979984 is about 464.1279126141.

The spelling of 99979984 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred eighty-four".