3888521685 has 12 divisors (see below), whose sum is σ = 6740104332. Its totient is φ = 2073878208.

The previous prime is 3888521683. The next prime is 3888521701. The reversal of 3888521685 is 5861258883.

It is a happy number.

3888521685 is a `hidden beast` number, since 38 + 8 + 8 + 521 + 6 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1402202916 + 2486318769 = 37446^2 + 49863^2 .

It is not a de Polignac number, because 3888521685 - 2¹ = 3888521683 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3888521683) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 43205752 + ... + 43205841.

It is an arithmetic number, because the mean of its divisors is an integer number (561675361).

Almost surely, 2^3888521685 is an apocalyptic number.

It is an amenable number.

3888521685 is a deficient number, since it is larger than the sum of its proper divisors (2851582647).

3888521685 is a wasteful number, since it uses less digits than its factorization.

3888521685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86411604 (or 86411601 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 54.

The square root of 3888521685 is about 62358.0121957075. The cubic root of 3888521685 is about 1572.5151626740.

The spelling of 3888521685 in words is "three billion, eight hundred eighty-eight million, five hundred twenty-one thousand, six hundred eighty-five".