12640136 has 32 divisors (see below), whose sum is σ = 24607800. Its totient is φ = 6082560.

The previous prime is 12640123. The next prime is 12640141. The reversal of 12640136 is 63104621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2992900 + 9647236 = 1730^2 + 3106^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 28976 + ... + 29408.

Almost surely, 2^12640136 is an apocalyptic number.

It is an amenable number.

12640136 is a deficient number, since it is larger than the sum of its proper divisors (11967664).

12640136 is a wasteful number, since it uses less digits than its factorization.

12640136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 12640136 is about 3555.2968933691. The cubic root of 12640136 is about 232.9434923477.

Adding to 12640136 its reverse (63104621), we get a palindrome (75744757).

The spelling of 12640136 in words is "twelve million, six hundred forty thousand, one hundred thirty-six".