3999115616 has 48 divisors (see below), whose sum is σ = 8239644000. Its totient is φ = 1907017728.

The previous prime is 3999115613. The next prime is 3999115621. The reversal of 3999115616 is 6165119993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999115613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249080 + ... + 264648.

It is an arithmetic number, because the mean of its divisors is an integer number (171659250).

Almost surely, 2^3999115616 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 3999115616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4119822000).

3999115616 is an abundant number, since it is smaller than the sum of its proper divisors (4240528384).

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

3999115616 is a wasteful number, since it uses less digits than its factorization.

3999115616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15951 (or 15943 counting only the distinct ones).

The product of its digits is 393660, while the sum is 50.

The square root of 3999115616 is about 63238.5611474518. The cubic root of 3999115616 is about 1587.2840540042.

The spelling of 3999115616 in words is "three billion, nine hundred ninety-nine million, one hundred fifteen thousand, six hundred sixteen".