3987765931 has 8 divisors (see below), whose sum is σ = 4052916144. Its totient is φ = 3923119200.

The previous prime is 3987765919. The next prime is 3987765937. The reversal of 3987765931 is 1395677893.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3987765931 is a prime.

It is a super-2 number, since 2×3987765931² = 31804554240888593522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3987765937) 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 7 ways as a sum of consecutive naturals, for example, 109885 + ... + 141598.

It is an arithmetic number, because the mean of its divisors is an integer number (506614518).

Almost surely, 2^3987765931 is an apocalyptic number.

3987765931 is a deficient number, since it is larger than the sum of its proper divisors (65150213).

3987765931 is a wasteful number, since it uses less digits than its factorization.

3987765931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251741.

The product of its digits is 8573040, while the sum is 58.

The square root of 3987765931 is about 63148.7603282915. The cubic root of 3987765931 is about 1585.7810347270.

The spelling of 3987765931 in words is "three billion, nine hundred eighty-seven million, seven hundred sixty-five thousand, nine hundred thirty-one".