3999011968 has 64 divisors (see below), whose sum is σ = 9276793920. Its totient is φ = 1681505280.

The previous prime is 3999011959. The next prime is 3999011969. The reversal of 3999011968 is 8691109993.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (3999011969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383 + ... + 89593.

It is an arithmetic number, because the mean of its divisors is an integer number (144949905).

Almost surely, 2^3999011968 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 3999011968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4638396960).

3999011968 is an abundant number, since it is smaller than the sum of its proper divisors (5277781952).

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

3999011968 is an equidigital number, since it uses as much as digits as its factorization.

3999011968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84285 (or 84273 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 3999011968 is about 63237.7416421554. The cubic root of 3999011968 is about 1587.2703409524.

The spelling of 3999011968 in words is "three billion, nine hundred ninety-nine million, eleven thousand, nine hundred sixty-eight".