12738538 has 4 divisors (see below), whose sum is σ = 19107810. Its totient is φ = 6369268.

The previous prime is 12738533. The next prime is 12738563. The reversal of 12738538 is 83583721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7689529 + 5049009 = 2773^2 + 2247^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12738497 and 12738506.

It is not an unprimeable number, because it can be changed into a prime (12738533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3184633 + ... + 3184636.

Almost surely, 2^12738538 is an apocalyptic number.

12738538 is a deficient number, since it is larger than the sum of its proper divisors (6369272).

12738538 is an equidigital number, since it uses as much as digits as its factorization.

12738538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369271.

The product of its digits is 40320, while the sum is 37.

The square root of 12738538 is about 3569.1088523608. The cubic root of 12738538 is about 233.5464098975.

The spelling of 12738538 in words is "twelve million, seven hundred thirty-eight thousand, five hundred thirty-eight".