3999880320 has 256 divisors, whose sum is σ = 13562899200. Its totient is φ = 1000423424.

The previous prime is 3999880319. The next prime is 3999880327. The reversal of 3999880320 is 230889993.

It is not an unprimeable number, because it can be changed into a prime (3999880327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2339626 + ... + 2341334.

It is an arithmetic number, because the mean of its divisors is an integer number (52980075).

Almost surely, 2^3999880320 is an apocalyptic number.

3999880320 is a gapful number since it is divisible by the number (30) 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 3999880320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6781449600).

3999880320 is an abundant number, since it is smaller than the sum of its proper divisors (9563018880).

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

3999880320 is a wasteful number, since it uses less digits than its factorization.

3999880320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807 (or 1795 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 3999880320 is about 63244.6070428143. The cubic root of 3999880320 is about 1587.3852201305.

The spelling of 3999880320 in words is "three billion, nine hundred ninety-nine million, eight hundred eighty thousand, three hundred twenty".