3987919625 has 8 divisors (see below), whose sum is σ = 4976923848. Its totient is φ = 3190335600.

The previous prime is 3987919613. The next prime is 3987919643. The reversal of 3987919625 is 5269197893.

It can be written as a sum of positive squares in 4 ways, for example, as 877403641 + 3110515984 = 29621^2 + 55772^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3987919625 is a prime.

It is a Duffinian number.

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, 15951554 + ... + 15951803.

It is an arithmetic number, because the mean of its divisors is an integer number (622115481).

Almost surely, 2^3987919625 is an apocalyptic number.

It is an amenable number.

3987919625 is a deficient number, since it is larger than the sum of its proper divisors (989004223).

3987919625 is an equidigital number, since it uses as much as digits as its factorization.

3987919625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31903372 (or 31903362 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 59.

The square root of 3987919625 is about 63149.9772367338. The cubic root of 3987919625 is about 1585.8014071948.

The spelling of 3987919625 in words is "three billion, nine hundred eighty-seven million, nine hundred nineteen thousand, six hundred twenty-five".