12009638 has 16 divisors (see below), whose sum is σ = 18585504. Its totient is φ = 5816640.

The previous prime is 12009637. The next prime is 12009643. The reversal of 12009638 is 83690021.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12009638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009637) 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 7 ways as a sum of consecutive naturals, for example, 13256 + ... + 14132.

It is an arithmetic number, because the mean of its divisors is an integer number (1161594).

Almost surely, 2^12009638 is an apocalyptic number.

12009638 is a deficient number, since it is larger than the sum of its proper divisors (6575866).

12009638 is a wasteful number, since it uses less digits than its factorization.

12009638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 12009638 is about 3465.4924613971. The cubic root of 12009638 is about 229.0041251966.

Adding to 12009638 its reverse (83690021), we get a palindrome (95699659).

The spelling of 12009638 in words is "twelve million, nine thousand, six hundred thirty-eight".