12013638 has 32 divisors (see below), whose sum is σ = 29573376. Its totient is φ = 3168288.

The previous prime is 12013637. The next prime is 12013663. The reversal of 12013638 is 83631021.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013637) 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 15 ways as a sum of consecutive naturals, for example, 10456 + ... + 11547.

It is an arithmetic number, because the mean of its divisors is an integer number (924168).

Almost surely, 2^12013638 is an apocalyptic number.

12013638 is an abundant number, since it is smaller than the sum of its proper divisors (17559738).

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

12013638 is a wasteful number, since it uses less digits than its factorization.

12013638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22028.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 12013638 is about 3466.0695319050. The cubic root of 12013638 is about 229.0295468572.

Adding to 12013638 its reverse (83631021), we get a palindrome (95644659).

The spelling of 12013638 in words is "twelve million, thirteen thousand, six hundred thirty-eight".