389078839 has 2 divisors, whose sum is σ = 389078840. Its totient is φ = 389078838.

The previous prime is 389078773. The next prime is 389078843. The reversal of 389078839 is 938870983.

It is a strong prime.

It is an emirp because it is prime and its reverse (938870983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389078839 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389078839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389072839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194539419 + 194539420.

It is an arithmetic number, because the mean of its divisors is an integer number (194539420).

Almost surely, 2^389078839 is an apocalyptic number.

389078839 is a deficient number, since it is larger than the sum of its proper divisors (1).

389078839 is an equidigital number, since it uses as much as digits as its factorization.

389078839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 389078839 is about 19725.0814700472. The cubic root of 389078839 is about 730.0386787537.

The spelling of 389078839 in words is "three hundred eighty-nine million, seventy-eight thousand, eight hundred thirty-nine".