9999999984 has 160 divisors (see below), whose sum is σ = 29102137344. Its totient is φ = 2935848960.

The previous prime is 9999999967. The next prime is 10000000019. The reversal of 9999999984 is 4899999999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999999897 and 9999999906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9199089 + ... + 9200175.

Almost surely, 2^9999999984 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 9999999984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14551068672).

9999999984 is an abundant number, since it is smaller than the sum of its proper divisors (19102137360).

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

9999999984 is a wasteful number, since it uses less digits than its factorization.

9999999984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1769 counting only the distinct ones).

The product of its digits is 1377495072, while the sum is 84.

The square root of 9999999984 is about 99999.9999200000. Note that the first 4 decimals coincide. The cubic root of 9999999984 is about 2154.4346888829.

The spelling of 9999999984 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-four".