389597639 has 2 divisors, whose sum is σ = 389597640. Its totient is φ = 389597638.

The previous prime is 389597633. The next prime is 389597707. The reversal of 389597639 is 936795983.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389597639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389597633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194798819 + 194798820.

It is an arithmetic number, because the mean of its divisors is an integer number (194798820).

Almost surely, 2^389597639 is an apocalyptic number.

389597639 is a deficient number, since it is larger than the sum of its proper divisors (1).

389597639 is an equidigital number, since it uses as much as digits as its factorization.

389597639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 59.

The square root of 389597639 is about 19738.2278586503. The cubic root of 389597639 is about 730.3630139213.

The spelling of 389597639 in words is "three hundred eighty-nine million, five hundred ninety-seven thousand, six hundred thirty-nine".