1388838457 has 2 divisors, whose sum is σ = 1388838458. Its totient is φ = 1388838456.

The previous prime is 1388838427. The next prime is 1388838461. The reversal of 1388838457 is 7548388831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297368361 + 91470096 = 36019^2 + 9564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388838457 - 2²³ = 1380449849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1388838398 and 1388838407.

It is not a weakly prime, because it can be changed into another prime (1388838427) 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, 694419228 + 694419229.

It is an arithmetic number, because the mean of its divisors is an integer number (694419229).

Almost surely, 2^1388838457 is an apocalyptic number.

It is an amenable number.

1388838457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388838457 is an equidigital number, since it uses as much as digits as its factorization.

1388838457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5160960, while the sum is 55.

The square root of 1388838457 is about 37267.1230040635. The cubic root of 1388838457 is about 1115.7080789996.

The spelling of 1388838457 in words is "one billion, three hundred eighty-eight million, eight hundred thirty-eight thousand, four hundred fifty-seven".