389461021 has 2 divisors, whose sum is σ = 389461022. Its totient is φ = 389461020.

The previous prime is 389460959. The next prime is 389461043. The reversal of 389461021 is 120164983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209525625 + 179935396 = 14475^2 + 13414^2 .

It is a cyclic number.

It is not a de Polignac number, because 389461021 - 2⁹ = 389460509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389461081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194730510 + 194730511.

It is an arithmetic number, because the mean of its divisors is an integer number (194730511).

Almost surely, 2^389461021 is an apocalyptic number.

It is an amenable number.

389461021 is a deficient number, since it is larger than the sum of its proper divisors (1).

389461021 is an equidigital number, since it uses as much as digits as its factorization.

389461021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 389461021 is about 19734.7668088579. The cubic root of 389461021 is about 730.2776331851.

The spelling of 389461021 in words is "three hundred eighty-nine million, four hundred sixty-one thousand, twenty-one".