389934257 has 2 divisors, whose sum is σ = 389934258. Its totient is φ = 389934256.

The previous prime is 389934247. The next prime is 389934263. The reversal of 389934257 is 752439983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273207841 + 116726416 = 16529^2 + 10804^2 .

It is an emirp because it is prime and its reverse (752439983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389934257 - 2⁴ = 389934241 is a prime.

It is not a weakly prime, because it can be changed into another prime (389934217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194967128 + 194967129.

It is an arithmetic number, because the mean of its divisors is an integer number (194967129).

Almost surely, 2^389934257 is an apocalyptic number.

It is an amenable number.

389934257 is a deficient number, since it is larger than the sum of its proper divisors (1).

389934257 is an equidigital number, since it uses as much as digits as its factorization.

389934257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 389934257 is about 19746.7530748728. The cubic root of 389934257 is about 730.5733014414.

The spelling of 389934257 in words is "three hundred eighty-nine million, nine hundred thirty-four thousand, two hundred fifty-seven".