1388399497 has 2 divisors, whose sum is σ = 1388399498. Its totient is φ = 1388399496.

The previous prime is 1388399491. The next prime is 1388399539. The reversal of 1388399497 is 7949938831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1306750201 + 81649296 = 36149^2 + 9036^2 .

It is an emirp because it is prime and its reverse (7949938831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1388399497 - 2¹¹ = 1388397449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388399491) 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, 694199748 + 694199749.

It is an arithmetic number, because the mean of its divisors is an integer number (694199749).

Almost surely, 2^1388399497 is an apocalyptic number.

It is an amenable number.

1388399497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388399497 is an equidigital number, since it uses as much as digits as its factorization.

1388399497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 61.

The square root of 1388399497 is about 37261.2331653154. The cubic root of 1388399497 is about 1115.5905220530.

The spelling of 1388399497 in words is "one billion, three hundred eighty-eight million, three hundred ninety-nine thousand, four hundred ninety-seven".