3999820384 has 144 divisors (see below), whose sum is σ = 9855294624. Its totient is φ = 1559900160.

The previous prime is 3999820373. The next prime is 3999820421. The reversal of 3999820384 is 4830289993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3658942 + ... + 3660034.

It is an arithmetic number, because the mean of its divisors is an integer number (68439546).

Almost surely, 2^3999820384 is an apocalyptic number.

3999820384 is a gapful number since it is divisible by the number (34) 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 3999820384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4927647312).

3999820384 is an abundant number, since it is smaller than the sum of its proper divisors (5855474240).

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

3999820384 is a wasteful number, since it uses less digits than its factorization.

3999820384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 55.

The square root of 3999820384 is about 63244.1331982659. The cubic root of 3999820384 is about 1587.3772913936.

The spelling of 3999820384 in words is "three billion, nine hundred ninety-nine million, eight hundred twenty thousand, three hundred eighty-four".