388139033 has 2 divisors, whose sum is σ = 388139034. Its totient is φ = 388139032.

The previous prime is 388139021. The next prime is 388139041. The reversal of 388139033 is 330931883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211062784 + 177076249 = 14528^2 + 13307^2 .

It is an emirp because it is prime and its reverse (330931883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388139033 - 2¹⁸ = 387876889 is a prime.

It is not a weakly prime, because it can be changed into another prime (388139233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194069516 + 194069517.

It is an arithmetic number, because the mean of its divisors is an integer number (194069517).

Almost surely, 2^388139033 is an apocalyptic number.

It is an amenable number.

388139033 is a deficient number, since it is larger than the sum of its proper divisors (1).

388139033 is an equidigital number, since it uses as much as digits as its factorization.

388139033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 388139033 is about 19701.2444530796. The cubic root of 388139033 is about 729.4504107588.

The spelling of 388139033 in words is "three hundred eighty-eight million, one hundred thirty-nine thousand, thirty-three".