1388232401 has 2 divisors, whose sum is σ = 1388232402. Its totient is φ = 1388232400.

The previous prime is 1388232389. The next prime is 1388232409. The reversal of 1388232401 is 1042328831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784056001 + 604176400 = 28001^2 + 24580^2 .

It is an emirp because it is prime and its reverse (1042328831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388232401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388232409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694116200 + 694116201.

It is an arithmetic number, because the mean of its divisors is an integer number (694116201).

Almost surely, 2^1388232401 is an apocalyptic number.

It is an amenable number.

1388232401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388232401 is an equidigital number, since it uses as much as digits as its factorization.

1388232401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1388232401 is about 37258.9908746869. The cubic root of 1388232401 is about 1115.5457659164.

The spelling of 1388232401 in words is "one billion, three hundred eighty-eight million, two hundred thirty-two thousand, four hundred one".