3999849984 has 240 divisors, whose sum is σ = 12897476592. Its totient is φ = 1230225408.

The previous prime is 3999849949. The next prime is 3999850007. The reversal of 3999849984 is 4899489993.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

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, 1616172 + ... + 1618644.

Almost surely, 2^3999849984 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 3999849984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6448738296).

3999849984 is an abundant number, since it is smaller than the sum of its proper divisors (8897626608).

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

3999849984 is an equidigital number, since it uses as much as digits as its factorization.

3999849984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519 (or 2491 counting only the distinct ones).

The product of its digits is 181398528, while the sum is 72.

The square root of 3999849984 is about 63244.3672116340. The cubic root of 3999849984 is about 1587.3812070904.

The spelling of 3999849984 in words is "three billion, nine hundred ninety-nine million, eight hundred forty-nine thousand, nine hundred eighty-four".