389664439 has 2 divisors, whose sum is σ = 389664440. Its totient is φ = 389664438.

The previous prime is 389664343. The next prime is 389664449. The reversal of 389664439 is 934466983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 389664439 - 2⁷ = 389664311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389664449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194832219 + 194832220.

It is an arithmetic number, because the mean of its divisors is an integer number (194832220).

Almost surely, 2^389664439 is an apocalyptic number.

389664439 is a deficient number, since it is larger than the sum of its proper divisors (1).

389664439 is an equidigital number, since it uses as much as digits as its factorization.

389664439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 52.

The square root of 389664439 is about 19739.9199339815. The cubic root of 389664439 is about 730.4047539596.

The spelling of 389664439 in words is "three hundred eighty-nine million, six hundred sixty-four thousand, four hundred thirty-nine".