384239689 has 2 divisors, whose sum is σ = 384239690. Its totient is φ = 384239688.

The previous prime is 384239677. The next prime is 384239743. The reversal of 384239689 is 986932483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382593600 + 1646089 = 19560^2 + 1283^2 .

It is an emirp because it is prime and its reverse (986932483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384239689 is a prime.

It is not a weakly prime, because it can be changed into another prime (384239629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192119844 + 192119845.

It is an arithmetic number, because the mean of its divisors is an integer number (192119845).

Almost surely, 2^384239689 is an apocalyptic number.

It is an amenable number.

384239689 is a deficient number, since it is larger than the sum of its proper divisors (1).

384239689 is an equidigital number, since it uses as much as digits as its factorization.

384239689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 52.

The square root of 384239689 is about 19602.0327772402. The cubic root of 384239689 is about 726.9994361705. Note that the first 3 decimals are identical.

The spelling of 384239689 in words is "three hundred eighty-four million, two hundred thirty-nine thousand, six hundred eighty-nine".