3987765189 has 20 divisors (see below), whose sum is σ = 5958819724. Its totient is φ = 2657712384.

The previous prime is 3987765181. The next prime is 3987765203. The reversal of 3987765189 is 9815677893.

3987765189 is a `hidden beast` number, since 39 + 87 + 7 + 6 + 518 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2375100225 + 1612664964 = 48735^2 + 40158^2 .

It is not a de Polignac number, because 3987765189 - 2³ = 3987765181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987765181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 406389 + ... + 416085.

Almost surely, 2^3987765189 is an apocalyptic number.

It is an amenable number.

3987765189 is a deficient number, since it is larger than the sum of its proper divisors (1971054535).

3987765189 is an equidigital number, since it uses as much as digits as its factorization.

3987765189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14786 (or 14777 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The square root of 3987765189 is about 63148.7544532748. The cubic root of 3987765189 is about 1585.7809363720.

The spelling of 3987765189 in words is "three billion, nine hundred eighty-seven million, seven hundred sixty-five thousand, one hundred eighty-nine".