3999949824 has 176 divisors, whose sum is σ = 11796091328. Its totient is φ = 1197047808.

The previous prime is 3999949823. The next prime is 3999949829. The reversal of 3999949824 is 4289499993.

It is not an unprimeable number, because it can be changed into a prime (3999949823) 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 15 ways as a sum of consecutive naturals, for example, 1476279 + ... + 1478985.

Almost surely, 2^3999949824 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 3999949824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5898045664).

3999949824 is an abundant number, since it is smaller than the sum of its proper divisors (7796141504).

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

3999949824 is a wasteful number, since it uses less digits than its factorization.

3999949824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780 (or 2762 counting only the distinct ones).

The product of its digits is 45349632, while the sum is 66.

The square root of 3999949824 is about 63245.1565260139. The cubic root of 3999949824 is about 1587.3944144875.

The spelling of 3999949824 in words is "three billion, nine hundred ninety-nine million, nine hundred forty-nine thousand, eight hundred twenty-four".