3987993508 has 12 divisors (see below), whose sum is σ = 6979442652. Its totient is φ = 1993867040.

The previous prime is 3987993491. The next prime is 3987993509. The reversal of 3987993508 is 8053997893.

It can be written as a sum of positive squares in 2 ways, for example, as 2307649444 + 1680344064 = 48038^2 + 40992^2 .

It is not an unprimeable number, because it can be changed into a prime (3987993509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80238 + ... + 120058.

It is an arithmetic number, because the mean of its divisors is an integer number (581620221).

Almost surely, 2^3987993508 is an apocalyptic number.

It is an amenable number.

3987993508 is a deficient number, since it is larger than the sum of its proper divisors (2991449144).

3987993508 is a wasteful number, since it uses less digits than its factorization.

3987993508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64862 (or 64860 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 61.

The square root of 3987993508 is about 63150.5622144411. The cubic root of 3987993508 is about 1585.8112003579.

The spelling of 3987993508 in words is "three billion, nine hundred eighty-seven million, nine hundred ninety-three thousand, five hundred eight".