3990181888 has 96 divisors (see below), whose sum is σ = 9947508480. Its totient is φ = 1554554880.

The previous prime is 3990181879. The next prime is 3990181907. The reversal of 3990181888 is 8881810993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145045 + ... + 170347.

It is an arithmetic number, because the mean of its divisors is an integer number (103619880).

Almost surely, 2^3990181888 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 3990181888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4973754240).

3990181888 is an abundant number, since it is smaller than the sum of its proper divisors (5957326592).

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

3990181888 is a wasteful number, since it uses less digits than its factorization.

3990181888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25343 (or 25323 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 55.

The square root of 3990181888 is about 63167.8865247208. The cubic root of 3990181888 is about 1586.1012144484.

The spelling of 3990181888 in words is "three billion, nine hundred ninety million, one hundred eighty-one thousand, eight hundred eighty-eight".