12565138 has 4 divisors (see below), whose sum is σ = 18847710. Its totient is φ = 6282568.

The previous prime is 12565129. The next prime is 12565139. The reversal of 12565138 is 83156521.

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., 11675889 + 889249 = 3417^2 + 943^2 .

It is not an unprimeable number, because it can be changed into a prime (12565139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3141283 + ... + 3141286.

Almost surely, 2^12565138 is an apocalyptic number.

12565138 is a deficient number, since it is larger than the sum of its proper divisors (6282572).

12565138 is an equidigital number, since it uses as much as digits as its factorization.

12565138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282571.

The product of its digits is 7200, while the sum is 31.

The square root of 12565138 is about 3544.7338405020. The cubic root of 12565138 is about 232.4818685518.

It can be divided in two parts, 1256513 and 8, that added together give a palindrome (1256521).

The spelling of 12565138 in words is "twelve million, five hundred sixty-five thousand, one hundred thirty-eight".