12786541 has 4 divisors (see below), whose sum is σ = 12930300. Its totient is φ = 12642784.

The previous prime is 12786511. The next prime is 12786559. The reversal of 12786541 is 14568721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14568721 = 97 ⋅150193.

It can be written as a sum of positive squares in 2 ways, for example, as 1368900 + 11417641 = 1170^2 + 3379^2 .

It is a cyclic number.

It is not a de Polignac number, because 12786541 - 2⁵ = 12786509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12786497 and 12786506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12786511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71746 + ... + 71923.

It is an arithmetic number, because the mean of its divisors is an integer number (3232575).

Almost surely, 2^12786541 is an apocalyptic number.

It is an amenable number.

12786541 is a deficient number, since it is larger than the sum of its proper divisors (143759).

12786541 is an equidigital number, since it uses as much as digits as its factorization.

12786541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143758.

The product of its digits is 13440, while the sum is 34.

The square root of 12786541 is about 3575.8273168597. The cubic root of 12786541 is about 233.8394020647.

It can be divided in two parts, 127 and 86541, that added together give a palindrome (86668).

The spelling of 12786541 in words is "twelve million, seven hundred eighty-six thousand, five hundred forty-one".