9999984 has 20 divisors (see below), whose sum is σ = 25833416. Its totient is φ = 3333312.

The previous prime is 9999973. The next prime is 9999991. The reversal of 9999984 is 4899999.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104119 + ... + 104214.

Almost surely, 2^9999984 is an apocalyptic number.

It is an amenable number.

9999984 is an abundant number, since it is smaller than the sum of its proper divisors (15833432).

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

9999984 is a wasteful number, since it uses less digits than its factorization.

9999984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208344 (or 208338 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 57.

The square root of 9999984 is about 3162.2751303452. The cubic root of 9999984 is about 215.4433540999.

The spelling of 9999984 in words is "nine million, nine hundred ninety-nine thousand, nine hundred eighty-four".