12804138 has 48 divisors (see below), whose sum is σ = 30232800. Its totient is φ = 3900960.

The previous prime is 12804137. The next prime is 12804151. The reversal of 12804138 is 83140821.

It is not an unprimeable number, because it can be changed into a prime (12804137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9273 + ... + 10563.

It is an arithmetic number, because the mean of its divisors is an integer number (629850).

Almost surely, 2^12804138 is an apocalyptic number.

12804138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12804138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15116400).

12804138 is an abundant number, since it is smaller than the sum of its proper divisors (17428662).

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

12804138 is a wasteful number, since it uses less digits than its factorization.

12804138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 12804138 is about 3578.2870203493. The cubic root of 12804138 is about 233.9466238107.

Adding to 12804138 its reverse (83140821), we get a palindrome (95944959).

The spelling of 12804138 in words is "twelve million, eight hundred four thousand, one hundred thirty-eight".