3990000000 has 512 divisors, whose sum is σ = 15937459200. Its totient is φ = 864000000.

The previous prime is 3989999989. The next prime is 3990000031. The reversal of 3990000000 is 993.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209999991 + ... + 210000009.

It is an arithmetic number, because the mean of its divisors is an integer number (31127850).

Almost surely, 2^3990000000 is an apocalyptic number.

3990000000 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 3990000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7968729600).

3990000000 is an abundant number, since it is smaller than the sum of its proper divisors (11947459200).

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

3990000000 is an frugal number, since it uses more digits than its factorization.

3990000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 3990000000 is about 63166.4467894150. The cubic root of 3990000000 is about 1586.0771138628.

Adding to 3990000000 its reverse (993), we get a palindrome (3990000993).

The spelling of 3990000000 in words is "three billion, nine hundred ninety million", and thus it is an aban number.