388442689 has 2 divisors, whose sum is σ = 388442690. Its totient is φ = 388442688.

The previous prime is 388442603. The next prime is 388442723. The reversal of 388442689 is 986244883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346257664 + 42185025 = 18608^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 388442689 - 2²¹ = 386345537 is a prime.

It is not a weakly prime, because it can be changed into another prime (388442389) 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, 194221344 + 194221345.

It is an arithmetic number, because the mean of its divisors is an integer number (194221345).

Almost surely, 2^388442689 is an apocalyptic number.

It is an amenable number.

388442689 is a deficient number, since it is larger than the sum of its proper divisors (1).

388442689 is an equidigital number, since it uses as much as digits as its factorization.

388442689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 52.

The square root of 388442689 is about 19708.9494646468. The cubic root of 388442689 is about 729.6405868186.

The spelling of 388442689 in words is "three hundred eighty-eight million, four hundred forty-two thousand, six hundred eighty-nine".