3990689988 has 24 divisors (see below), whose sum is σ = 9379581792. Its totient is φ = 1320519744.

The previous prime is 3990689951. The next prime is 3990690017. The reversal of 3990689988 is 8899860993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1212070 + ... + 1215357.

It is an arithmetic number, because the mean of its divisors is an integer number (390815908).

Almost surely, 2^3990689988 is an apocalyptic number.

It is an amenable number.

3990689988 is an abundant number, since it is smaller than the sum of its proper divisors (5388891804).

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

3990689988 is a wasteful number, since it uses less digits than its factorization.

3990689988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427571 (or 2427569 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 69.

The square root of 3990689988 is about 63171.9082187645. The cubic root of 3990689988 is about 1586.1685350072.

The spelling of 3990689988 in words is "three billion, nine hundred ninety million, six hundred eighty-nine thousand, nine hundred eighty-eight".