12538009 has 4 divisors (see below), whose sum is σ = 13677840. Its totient is φ = 11398180.

The previous prime is 12538003. The next prime is 12538033. The reversal of 12538009 is 90083521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90083521 = 11 ⋅8189411.

It is a cyclic number.

It is not a de Polignac number, because 12538009 - 2⁵ = 12537977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12538003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569899 + ... + 569920.

It is an arithmetic number, because the mean of its divisors is an integer number (3419460).

Almost surely, 2^12538009 is an apocalyptic number.

It is an amenable number.

12538009 is a deficient number, since it is larger than the sum of its proper divisors (1139831).

12538009 is a wasteful number, since it uses less digits than its factorization.

12538009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139830.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12538009 is about 3540.9051102790. The cubic root of 12538009 is about 232.3144331935.

The spelling of 12538009 in words is "twelve million, five hundred thirty-eight thousand, nine".