3999522816 has 168 divisors, whose sum is σ = 12236921424. Its totient is φ = 1254359040.

The previous prime is 3999522811. The next prime is 3999522841. The reversal of 3999522816 is 6182259993.

It is a happy number.

3999522816 is a `hidden beast` number, since 39 + 9 + 9 + 522 + 81 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

Its product of digits (2099520) is a multiple of the sum of its prime factors (3240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999522811) 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 11 ways as a sum of consecutive naturals, for example, 1251781 + ... + 1254971.

It is an arithmetic number, because the mean of its divisors is an integer number (72838818).

Almost surely, 2^3999522816 is an apocalyptic number.

3999522816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3999522816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6118460712).

3999522816 is an abundant number, since it is smaller than the sum of its proper divisors (8237398608).

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

3999522816 is a wasteful number, since it uses less digits than its factorization.

3999522816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240 (or 3213 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 3999522816 is about 63241.7806200932. The cubic root of 3999522816 is about 1587.3379259259.

The spelling of 3999522816 in words is "three billion, nine hundred ninety-nine million, five hundred twenty-two thousand, eight hundred sixteen".