12538409 has 8 divisors (see below), whose sum is σ = 13655880. Its totient is φ = 11442816.

The previous prime is 12538399. The next prime is 12538417. The reversal of 12538409 is 90483521.

It can be written as a sum of positive squares in 4 ways, for example, as 183184 + 12355225 = 428^2 + 3515^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12538409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12538439) 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 7 ways as a sum of consecutive naturals, for example, 4262 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (1706985).

Almost surely, 2^12538409 is an apocalyptic number.

It is an amenable number.

12538409 is a deficient number, since it is larger than the sum of its proper divisors (1117471).

12538409 is a wasteful number, since it uses less digits than its factorization.

12538409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10939.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 12538409 is about 3540.9615925621. The cubic root of 12538409 is about 232.3169036757.

The spelling of 12538409 in words is "twelve million, five hundred thirty-eight thousand, four hundred nine".