389517643 has 2 divisors, whose sum is σ = 389517644. Its totient is φ = 389517642.

The previous prime is 389517619. The next prime is 389517679. The reversal of 389517643 is 346715983.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389517643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 389517593 and 389517602.

It is not a weakly prime, because it can be changed into another prime (389517943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194758821 + 194758822.

It is an arithmetic number, because the mean of its divisors is an integer number (194758822).

Almost surely, 2^389517643 is an apocalyptic number.

389517643 is a deficient number, since it is larger than the sum of its proper divisors (1).

389517643 is an equidigital number, since it uses as much as digits as its factorization.

389517643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 389517643 is about 19736.2013315633. The cubic root of 389517643 is about 730.3130220723.

The spelling of 389517643 in words is "three hundred eighty-nine million, five hundred seventeen thousand, six hundred forty-three".