3987591705 has 24 divisors (see below), whose sum is σ = 6921882240. Its totient is φ = 2123621280.

The previous prime is 3987591701. The next prime is 3987591781. The reversal of 3987591705 is 5071957893.

It is not a de Polignac number, because 3987591705 - 2² = 3987591701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3987591701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33025 + ... + 95214.

It is an arithmetic number, because the mean of its divisors is an integer number (288411760).

Almost surely, 2^3987591705 is an apocalyptic number.

It is an amenable number.

3987591705 is a deficient number, since it is larger than the sum of its proper divisors (2934290535).

3987591705 is a wasteful number, since it uses less digits than its factorization.

3987591705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128941 (or 128938 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The square root of 3987591705 is about 63147.3808245441. The cubic root of 3987591705 is about 1585.7579400657.

The spelling of 3987591705 in words is "three billion, nine hundred eighty-seven million, five hundred ninety-one thousand, seven hundred five".