3985931808 has 48 divisors (see below), whose sum is σ = 11625636960. Its totient is φ = 1328643648.

The previous prime is 3985931797. The next prime is 3985931837. The reversal of 3985931808 is 8081395893.

3985931808 is a `hidden beast` number, since 39 + 8 + 593 + 18 + 0 + 8 = 666.

3985931808 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×3985931808² = 31775304756052297728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 2305810 + ... + 2307537.

It is an arithmetic number, because the mean of its divisors is an integer number (242200770).

Almost surely, 2^3985931808 is an apocalyptic number.

It is an amenable number.

3985931808 is an abundant number, since it is smaller than the sum of its proper divisors (7639705152).

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

3985931808 is a wasteful number, since it uses less digits than its factorization.

3985931808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613366 (or 4613352 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The square root of 3985931808 is about 63134.2364173354. The cubic root of 3985931808 is about 1585.5378774016.

The spelling of 3985931808 in words is "three billion, nine hundred eighty-five million, nine hundred thirty-one thousand, eight hundred eight".