3872685521 has 8 divisors (see below), whose sum is σ = 3951358824. Its totient is φ = 3794803200.

The previous prime is 3872685517. The next prime is 3872685529. The reversal of 3872685521 is 1255862783.

It can be written as a sum of positive squares in 4 ways, for example, as 1860714496 + 2011971025 = 43136^2 + 44855^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3872685521 - 2² = 3872685517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3872685529) 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, 187850 + ... + 207443.

It is an arithmetic number, because the mean of its divisors is an integer number (493919853).

Almost surely, 2^3872685521 is an apocalyptic number.

It is an amenable number.

3872685521 is a deficient number, since it is larger than the sum of its proper divisors (78673303).

3872685521 is a wasteful number, since it uses less digits than its factorization.

3872685521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395491.

The product of its digits is 806400, while the sum is 47.

The square root of 3872685521 is about 62230.9048704902. The cubic root of 3872685521 is about 1570.3775473749.

The spelling of 3872685521 in words is "three billion, eight hundred seventy-two million, six hundred eighty-five thousand, five hundred twenty-one".