12138566 has 8 divisors (see below), whose sum is σ = 19863144. Its totient is φ = 5517520.

The previous prime is 12138563. The next prime is 12138589. The reversal of 12138566 is 66583121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 275855 + ... + 275898.

It is an arithmetic number, because the mean of its divisors is an integer number (2482893).

Almost surely, 2^12138566 is an apocalyptic number.

12138566 is a deficient number, since it is larger than the sum of its proper divisors (7724578).

12138566 is a wasteful number, since it uses less digits than its factorization.

12138566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551766.

The product of its digits is 8640, while the sum is 32.

The square root of 12138566 is about 3484.0444888089. The cubic root of 12138566 is about 229.8206920059.

It can be divided in two parts, 1213 and 8566, that added together give a palindrome (9779).

The spelling of 12138566 in words is "twelve million, one hundred thirty-eight thousand, five hundred sixty-six".