388816789 has 2 divisors, whose sum is σ = 388816790. Its totient is φ = 388816788.

The previous prime is 388816711. The next prime is 388816801. The reversal of 388816789 is 987618883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328878225 + 59938564 = 18135^2 + 7742^2 .

It is a cyclic number.

It is not a de Polignac number, because 388816789 - 2¹⁵ = 388784021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388816709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194408394 + 194408395.

It is an arithmetic number, because the mean of its divisors is an integer number (194408395).

Almost surely, 2^388816789 is an apocalyptic number.

It is an amenable number.

388816789 is a deficient number, since it is larger than the sum of its proper divisors (1).

388816789 is an equidigital number, since it uses as much as digits as its factorization.

388816789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 58.

The square root of 388816789 is about 19718.4377930910. The cubic root of 388816789 is about 729.8747448823.

The spelling of 388816789 in words is "three hundred eighty-eight million, eight hundred sixteen thousand, seven hundred eighty-nine".