3990618840 has 256 divisors, whose sum is σ = 13412044800. Its totient is φ = 943257600.

The previous prime is 3990618817. The next prime is 3990618859. The reversal of 3990618840 is 488160993.

3990618840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 3990618840.

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, 8656210 + ... + 8656670.

It is an arithmetic number, because the mean of its divisors is an integer number (52390800).

Almost surely, 2^3990618840 is an apocalyptic number.

3990618840 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 3990618840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6706022400).

3990618840 is an abundant number, since it is smaller than the sum of its proper divisors (9421425960).

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

3990618840 is a wasteful number, since it uses less digits than its factorization.

3990618840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 3990618840 is about 63171.3450862019. The cubic root of 3990618840 is about 1586.1591086181.

The spelling of 3990618840 in words is "three billion, nine hundred ninety million, six hundred eighteen thousand, eight hundred forty".