3898632721 has 2 divisors, whose sum is σ = 3898632722. Its totient is φ = 3898632720.

The previous prime is 3898632653. The next prime is 3898632767. The reversal of 3898632721 is 1272368983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2894440000 + 1004192721 = 53800^2 + 31689^2 .

It is a cyclic number.

It is not a de Polignac number, because 3898632721 - 2⁹ = 3898632209 is a prime.

It is not a weakly prime, because it can be changed into another prime (3898638721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1949316360 + 1949316361.

It is an arithmetic number, because the mean of its divisors is an integer number (1949316361).

Almost surely, 2^3898632721 is an apocalyptic number.

It is an amenable number.

3898632721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898632721 is an equidigital number, since it uses as much as digits as its factorization.

3898632721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 3898632721 is about 62439.0320312543. The cubic root of 3898632721 is about 1573.8769480851.

The spelling of 3898632721 in words is "three billion, eight hundred ninety-eight million, six hundred thirty-two thousand, seven hundred twenty-one".