12931538 has 8 divisors (see below), whose sum is σ = 19416780. Its totient is φ = 6459280.

The previous prime is 12931493. The next prime is 12931549. The reversal of 12931538 is 83513921.

It can be written as a sum of positive squares in 2 ways, for example, as 10349089 + 2582449 = 3217^2 + 1607^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 5088.

Almost surely, 2^12931538 is an apocalyptic number.

12931538 is a deficient number, since it is larger than the sum of its proper divisors (6485242).

12931538 is a wasteful number, since it uses less digits than its factorization.

12931538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492.

The product of its digits is 6480, while the sum is 32.

The square root of 12931538 is about 3596.0447716901. The cubic root of 12931538 is about 234.7199803362.

The spelling of 12931538 in words is "twelve million, nine hundred thirty-one thousand, five hundred thirty-eight".