388238789 has 4 divisors (see below), whose sum is σ = 388288524. Its totient is φ = 388189056.

The previous prime is 388238731. The next prime is 388238797. The reversal of 388238789 is 987832883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168220900 + 220017889 = 12970^2 + 14833^2 .

It is a cyclic number.

It is not a de Polignac number, because 388238789 - 2²⁰ = 387190213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388238089) 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 3 ways as a sum of consecutive naturals, for example, 10322 + ... + 29715.

It is an arithmetic number, because the mean of its divisors is an integer number (97072131).

Almost surely, 2^388238789 is an apocalyptic number.

It is an amenable number.

388238789 is a deficient number, since it is larger than the sum of its proper divisors (49735).

388238789 is an equidigital number, since it uses as much as digits as its factorization.

388238789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49734.

The product of its digits is 4644864, while the sum is 56.

The square root of 388238789 is about 19703.7760086741. The cubic root of 388238789 is about 729.5128976651.

The spelling of 388238789 in words is "three hundred eighty-eight million, two hundred thirty-eight thousand, seven hundred eighty-nine".