1338637209 has 16 divisors (see below), whose sum is σ = 2196738432. Its totient is φ = 706094208.

The previous prime is 1338637207. The next prime is 1338637213. The reversal of 1338637209 is 9027368331.

It is a happy number.

It is not a de Polignac number, because 1338637209 - 2¹ = 1338637207 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1338637207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2451444 + ... + 2451989.

It is an arithmetic number, because the mean of its divisors is an integer number (137296152).

Almost surely, 2^1338637209 is an apocalyptic number.

It is an amenable number.

1338637209 is a deficient number, since it is larger than the sum of its proper divisors (858101223).

1338637209 is a wasteful number, since it uses less digits than its factorization.

1338637209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903456.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 1338637209 is about 36587.3913937575. The cubic root of 1338637209 is about 1102.0999030534.

The spelling of 1338637209 in words is "one billion, three hundred thirty-eight million, six hundred thirty-seven thousand, two hundred nine".