1338255749 has 2 divisors, whose sum is σ = 1338255750. Its totient is φ = 1338255748.

The previous prime is 1338255727. The next prime is 1338255791. The reversal of 1338255749 is 9475528331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1227100900 + 111154849 = 35030^2 + 10543^2 .

It is an emirp because it is prime and its reverse (9475528331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1338255749 - 2¹⁶ = 1338190213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338255049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669127874 + 669127875.

It is an arithmetic number, because the mean of its divisors is an integer number (669127875).

Almost surely, 2^1338255749 is an apocalyptic number.

It is an amenable number.

1338255749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338255749 is an equidigital number, since it uses as much as digits as its factorization.

1338255749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 1338255749 is about 36582.1780242784. The cubic root of 1338255749 is about 1101.9952077793.

The spelling of 1338255749 in words is "one billion, three hundred thirty-eight million, two hundred fifty-five thousand, seven hundred forty-nine".