389197681 has 2 divisors, whose sum is σ = 389197682. Its totient is φ = 389197680.

The previous prime is 389197673. The next prime is 389197693. The reversal of 389197681 is 186791983.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318301281 + 70896400 = 17841^2 + 8420^2 .

It is a cyclic number.

It is not a de Polignac number, because 389197681 - 2³ = 389197673 is a prime.

It is a super-2 number, since 2×389197681² = 302949669791555522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (389197621) 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, 194598840 + 194598841.

It is an arithmetic number, because the mean of its divisors is an integer number (194598841).

Almost surely, 2^389197681 is an apocalyptic number.

It is an amenable number.

389197681 is a deficient number, since it is larger than the sum of its proper divisors (1).

389197681 is an equidigital number, since it uses as much as digits as its factorization.

389197681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The square root of 389197681 is about 19728.0936990881. The cubic root of 389197681 is about 730.1129999590.

The spelling of 389197681 in words is "three hundred eighty-nine million, one hundred ninety-seven thousand, six hundred eighty-one".