388812469 has 2 divisors, whose sum is σ = 388812470. Its totient is φ = 388812468.

The previous prime is 388812343. The next prime is 388812497. The reversal of 388812469 is 964218883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287709444 + 101103025 = 16962^2 + 10055^2 .

It is a cyclic number.

It is not a de Polignac number, because 388812469 - 2²³ = 380423861 is a prime.

It is a super-3 number, since 3×388812469³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388812269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194406234 + 194406235.

It is an arithmetic number, because the mean of its divisors is an integer number (194406235).

Almost surely, 2^388812469 is an apocalyptic number.

It is an amenable number.

388812469 is a deficient number, since it is larger than the sum of its proper divisors (1).

388812469 is an equidigital number, since it uses as much as digits as its factorization.

388812469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 49.

The square root of 388812469 is about 19718.3282506403. The cubic root of 388812469 is about 729.8720417493.

The spelling of 388812469 in words is "three hundred eighty-eight million, eight hundred twelve thousand, four hundred sixty-nine".