12840136 has 8 divisors (see below), whose sum is σ = 24075270. Its totient is φ = 6420064.

The previous prime is 12840133. The next prime is 12840193. The reversal of 12840136 is 63104821.

12840136 is digitally balanced in base 2, 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 only one way, i.e., 12040900 + 799236 = 3470^2 + 894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12840136.

It is not an unprimeable number, because it can be changed into a prime (12840131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802501 + ... + 802516.

Almost surely, 2^12840136 is an apocalyptic number.

It is an amenable number.

12840136 is a deficient number, since it is larger than the sum of its proper divisors (11235134).

12840136 is a wasteful number, since it uses less digits than its factorization.

12840136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605023 (or 1605019 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 12840136 is about 3583.3135503330. The cubic root of 12840136 is about 234.1656605679.

Adding to 12840136 its reverse (63104821), we get a palindrome (75944957).

The spelling of 12840136 in words is "twelve million, eight hundred forty thousand, one hundred thirty-six".