389448739021 has 2 divisors, whose sum is σ = 389448739022. Its totient is φ = 389448739020.

The previous prime is 389448739003. The next prime is 389448739037. The reversal of 389448739021 is 120937844983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342939072100 + 46509666921 = 585610^2 + 215661^2 .

It is a cyclic number.

It is not a de Polignac number, because 389448739021 - 2¹³ = 389448730829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389448739091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194724369510 + 194724369511.

It is an arithmetic number, because the mean of its divisors is an integer number (194724369511).

Almost surely, 2^389448739021 is an apocalyptic number.

It is an amenable number.

389448739021 is a deficient number, since it is larger than the sum of its proper divisors (1).

389448739021 is an equidigital number, since it uses as much as digits as its factorization.

389448739021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 389448739021 in words is "three hundred eighty-nine billion, four hundred forty-eight million, seven hundred thirty-nine thousand, twenty-one".