388139315 has 8 divisors (see below), whose sum is σ = 490281360. Its totient is φ = 294168672.

The previous prime is 388139267. The next prime is 388139317. The reversal of 388139315 is 513931883.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388139315 is a prime.

It is not an unprimeable number, because it can be changed into a prime (388139317) 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 in 7 ways as a sum of consecutive naturals, for example, 2042744 + ... + 2042933.

It is an arithmetic number, because the mean of its divisors is an integer number (61285170).

Almost surely, 2^388139315 is an apocalyptic number.

388139315 is a deficient number, since it is larger than the sum of its proper divisors (102142045).

388139315 is a wasteful number, since it uses less digits than its factorization.

388139315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085701.

The product of its digits is 77760, while the sum is 41.

The square root of 388139315 is about 19701.2516099866. The cubic root of 388139315 is about 729.4505874180.

The spelling of 388139315 in words is "three hundred eighty-eight million, one hundred thirty-nine thousand, three hundred fifteen".