9915984 has 60 divisors (see below), whose sum is σ = 29891316. Its totient is φ = 3050496.

The previous prime is 9915979. The next prime is 9915991. The reversal of 9915984 is 4895199.

It can be written as a sum of positive squares in 2 ways, for example, as 4717584 + 5198400 = 2172^2 + 2280^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 777 + ... + 4520.

Almost surely, 2^9915984 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 9915984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14945658).

9915984 is an abundant number, since it is smaller than the sum of its proper divisors (19975332).

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

9915984 is a wasteful number, since it uses less digits than its factorization.

9915984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324 (or 5315 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 9915984 is about 3148.9655444288. The cubic root of 9915984 is about 214.8384147352.

The spelling of 9915984 in words is "nine million, nine hundred fifteen thousand, nine hundred eighty-four".