12681538 has 8 divisors (see below), whose sum is σ = 19190988. Its totient is φ = 6284544.

The previous prime is 12681527. The next prime is 12681577. The reversal of 12681538 is 83518621.

It can be written as a sum of positive squares in 2 ways, for example, as 7219969 + 5461569 = 2687^2 + 2337^2 .

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27831 + ... + 28282.

Almost surely, 2^12681538 is an apocalyptic number.

12681538 is a deficient number, since it is larger than the sum of its proper divisors (6509450).

12681538 is a wasteful number, since it uses less digits than its factorization.

12681538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56228.

The product of its digits is 11520, while the sum is 34.

The square root of 12681538 is about 3561.1147131200. The cubic root of 12681538 is about 233.1975459377.

The spelling of 12681538 in words is "twelve million, six hundred eighty-one thousand, five hundred thirty-eight".