3987976491 has 8 divisors (see below), whose sum is σ = 5908113360. Its totient is φ = 2658650976.

The previous prime is 3987976483. The next prime is 3987976537. The reversal of 3987976491 is 1946797893.

3987976491 is a `hidden beast` number, since 3 + 9 + 8 + 79 + 76 + 491 = 666.

It is not a de Polignac number, because 3987976491 - 2³ = 3987976483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3987976411) 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, 73851390 + ... + 73851443.

It is an arithmetic number, because the mean of its divisors is an integer number (738514170).

Almost surely, 2^3987976491 is an apocalyptic number.

3987976491 is a deficient number, since it is larger than the sum of its proper divisors (1920136869).

3987976491 is a wasteful number, since it uses less digits than its factorization.

3987976491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147702842 (or 147702836 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 3987976491 is about 63150.4274807384. The cubic root of 3987976491 is about 1585.8089447718.

The spelling of 3987976491 in words is "three billion, nine hundred eighty-seven million, nine hundred seventy-six thousand, four hundred ninety-one".