12536649 has 12 divisors (see below), whose sum is σ = 18155956. Its totient is φ = 8335872.

The previous prime is 12536647. The next prime is 12536653. The reversal of 12536649 is 94663521.

It is a happy number.

12536649 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 6 + 649 = 666.

12536649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6411024 + 6125625 = 2532^2 + 2475^2 .

It is not a de Polignac number, because 12536649 - 2¹ = 12536647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12536647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2289 + ... + 5505.

Almost surely, 2^12536649 is an apocalyptic number.

It is an amenable number.

12536649 is a deficient number, since it is larger than the sum of its proper divisors (5619307).

12536649 is a wasteful number, since it uses less digits than its factorization.

12536649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656 (or 3653 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 12536649 is about 3540.7130637768. The cubic root of 12536649 is about 232.3060331609.

The spelling of 12536649 in words is "twelve million, five hundred thirty-six thousand, six hundred forty-nine".