388628939 has 2 divisors, whose sum is σ = 388628940. Its totient is φ = 388628938.

The previous prime is 388628921. The next prime is 388629053. The reversal of 388628939 is 939826883.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 388628939 - 2⁸ = 388628683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388628039) 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, 194314469 + 194314470.

It is an arithmetic number, because the mean of its divisors is an integer number (194314470).

Almost surely, 2^388628939 is an apocalyptic number.

388628939 is a deficient number, since it is larger than the sum of its proper divisors (1).

388628939 is an equidigital number, since it uses as much as digits as its factorization.

388628939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 56.

The square root of 388628939 is about 19713.6739092438. The cubic root of 388628939 is about 729.7571838948.

The spelling of 388628939 in words is "three hundred eighty-eight million, six hundred twenty-eight thousand, nine hundred thirty-nine".