3986985321 has 24 divisors (see below), whose sum is σ = 6515212704. Its totient is φ = 2416353120.

The previous prime is 3986985313. The next prime is 3986985341. The reversal of 3986985321 is 1235896893.

3986985321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3986985321 - 2³ = 3986985313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3986985341) 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, 743116 + ... + 748461.

It is an arithmetic number, because the mean of its divisors is an integer number (271467196).

Almost surely, 2^3986985321 is an apocalyptic number.

It is an amenable number.

3986985321 is a deficient number, since it is larger than the sum of its proper divisors (2528227383).

3986985321 is a wasteful number, since it uses less digits than its factorization.

3986985321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491603 (or 1491591 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 3986985321 is about 63142.5793027178. The cubic root of 3986985321 is about 1585.6775551233.

The spelling of 3986985321 in words is "three billion, nine hundred eighty-six million, nine hundred eighty-five thousand, three hundred twenty-one".