1338638005 has 8 divisors (see below), whose sum is σ = 1610744832. Its totient is φ = 1067990928.

The previous prime is 1338637997. The next prime is 1338638009. The reversal of 1338638005 is 5008368331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1338638005 - 2³ = 1338637997 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 (1338638009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362917 + ... + 366586.

It is an arithmetic number, because the mean of its divisors is an integer number (201343104).

Almost surely, 2^1338638005 is an apocalyptic number.

It is an amenable number.

1338638005 is a deficient number, since it is larger than the sum of its proper divisors (272106827).

1338638005 is an equidigital number, since it uses as much as digits as its factorization.

1338638005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729875.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1338638005 is about 36587.4022718203. The cubic root of 1338638005 is about 1102.1001215023.

The spelling of 1338638005 in words is "one billion, three hundred thirty-eight million, six hundred thirty-eight thousand, five".