3838585721 has 2 divisors, whose sum is σ = 3838585722. Its totient is φ = 3838585720.

The previous prime is 3838585687. The next prime is 3838585741. The reversal of 3838585721 is 1275858383.

3838585721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2586841321 + 1251744400 = 50861^2 + 35380^2 .

It is a cyclic number.

It is not a de Polignac number, because 3838585721 - 2⁶ = 3838585657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3838585721.

It is not a weakly prime, because it can be changed into another prime (3838585741) 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 as a sum of consecutive naturals, namely, 1919292860 + 1919292861.

It is an arithmetic number, because the mean of its divisors is an integer number (1919292861).

Almost surely, 2^3838585721 is an apocalyptic number.

It is an amenable number.

3838585721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3838585721 is an equidigital number, since it uses as much as digits as its factorization.

3838585721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 50.

The square root of 3838585721 is about 61956.3210738017. The cubic root of 3838585721 is about 1565.7547858092.

The spelling of 3838585721 in words is "three billion, eight hundred thirty-eight million, five hundred eighty-five thousand, seven hundred twenty-one".