388841939 has 2 divisors, whose sum is σ = 388841940. Its totient is φ = 388841938.

The previous prime is 388841923. The next prime is 388841941. The reversal of 388841939 is 939148883.

It is a strong prime.

It is an emirp because it is prime and its reverse (939148883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388841939 - 2⁴ = 388841923 is a prime.

Together with 388841941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388841639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194420969 + 194420970.

It is an arithmetic number, because the mean of its divisors is an integer number (194420970).

Almost surely, 2^388841939 is an apocalyptic number.

388841939 is a deficient number, since it is larger than the sum of its proper divisors (1).

388841939 is an equidigital number, since it uses as much as digits as its factorization.

388841939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The square root of 388841939 is about 19719.0755107840. The cubic root of 388841939 is about 729.8904814748.

The spelling of 388841939 in words is "three hundred eighty-eight million, eight hundred forty-one thousand, nine hundred thirty-nine".