388665397 has 2 divisors, whose sum is σ = 388665398. Its totient is φ = 388665396.

The previous prime is 388665313. The next prime is 388665449. The reversal of 388665397 is 793566883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380679121 + 7986276 = 19511^2 + 2826^2 .

It is a cyclic number.

It is not a de Polignac number, because 388665397 - 2¹¹ = 388663349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388665307) 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, 194332698 + 194332699.

It is an arithmetic number, because the mean of its divisors is an integer number (194332699).

Almost surely, 2^388665397 is an apocalyptic number.

It is an amenable number.

388665397 is a deficient number, since it is larger than the sum of its proper divisors (1).

388665397 is an equidigital number, since it uses as much as digits as its factorization.

388665397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The square root of 388665397 is about 19714.5985756748. The cubic root of 388665397 is about 729.7800031386.

The spelling of 388665397 in words is "three hundred eighty-eight million, six hundred sixty-five thousand, three hundred ninety-seven".