12866538 has 32 divisors (see below), whose sum is σ = 26595072. Its totient is φ = 4147200.

The previous prime is 12866537. The next prime is 12866551. The reversal of 12866538 is 83566821.

It is a happy number.

12866538 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12866496 and 12866505.

It is not an unprimeable number, because it can be changed into a prime (12866537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47343 + ... + 47613.

It is an arithmetic number, because the mean of its divisors is an integer number (831096).

Almost surely, 2^12866538 is an apocalyptic number.

12866538 is an abundant number, since it is smaller than the sum of its proper divisors (13728534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12866538 is a wasteful number, since it uses less digits than its factorization.

12866538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its digits is 69120, while the sum is 39.

The square root of 12866538 is about 3586.9956788377. The cubic root of 12866538 is about 234.3260485145.

It can be divided in two parts, 128 and 66538, that added together give a palindrome (66666).

The spelling of 12866538 in words is "twelve million, eight hundred sixty-six thousand, five hundred thirty-eight".