1338127309 has 4 divisors (see below), whose sum is σ = 1384269660. Its totient is φ = 1291984960.

The previous prime is 1338127261. The next prime is 1338127381. The reversal of 1338127309 is 9037218331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1060804900 + 277322409 = 32570^2 + 16653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338127309 - 2²³ = 1329738701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338125309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23071132 + ... + 23071189.

It is an arithmetic number, because the mean of its divisors is an integer number (346067415).

Almost surely, 2^1338127309 is an apocalyptic number.

It is an amenable number.

1338127309 is a deficient number, since it is larger than the sum of its proper divisors (46142351).

1338127309 is an equidigital number, since it uses as much as digits as its factorization.

1338127309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46142350.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1338127309 is about 36580.4224825247. The cubic root of 1338127309 is about 1101.9599517398.

The spelling of 1338127309 in words is "one billion, three hundred thirty-eight million, one hundred twenty-seven thousand, three hundred nine".