3979985321 has 18 divisors (see below), whose sum is σ = 4382189370. Its totient is φ = 3613034880.

The previous prime is 3979985299. The next prime is 3979985351. The reversal of 3979985321 is 1235899793.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 3581424025 + 398561296 = 59845^2 + 19964^2 .

It is not a de Polignac number, because 3979985321 - 2¹⁰ = 3979984297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3979985351) 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 17 ways as a sum of consecutive naturals, for example, 625685 + ... + 632013.

It is an arithmetic number, because the mean of its divisors is an integer number (243454965).

Almost surely, 2^3979985321 is an apocalyptic number.

It is an amenable number.

3979985321 is a deficient number, since it is larger than the sum of its proper divisors (402204049).

3979985321 is an equidigital number, since it uses as much as digits as its factorization.

3979985321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477 (or 6403 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 56.

The square root of 3979985321 is about 63087.1248433466. The cubic root of 3979985321 is about 1584.7490135210.

The spelling of 3979985321 in words is "three billion, nine hundred seventy-nine million, nine hundred eighty-five thousand, three hundred twenty-one".