388709401 has 2 divisors, whose sum is σ = 388709402. Its totient is φ = 388709400.

The previous prime is 388709323. The next prime is 388709413. The reversal of 388709401 is 104907883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344473600 + 44235801 = 18560^2 + 6651^2 .

It is an emirp because it is prime and its reverse (104907883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388709401 - 2²³ = 380320793 is a prime.

It is not a weakly prime, because it can be changed into another prime (388709801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194354700 + 194354701.

It is an arithmetic number, because the mean of its divisors is an integer number (194354701).

Almost surely, 2^388709401 is an apocalyptic number.

It is an amenable number.

388709401 is a deficient number, since it is larger than the sum of its proper divisors (1).

388709401 is an equidigital number, since it uses as much as digits as its factorization.

388709401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 388709401 is about 19715.7145698552. The cubic root of 388709401 is about 729.8075435608.

The spelling of 388709401 in words is "three hundred eighty-eight million, seven hundred nine thousand, four hundred one".