12138404 has 12 divisors (see below), whose sum is σ = 21316764. Its totient is φ = 6047904.

The previous prime is 12138389. The next prime is 12138409. The reversal of 12138404 is 40483121.

It can be written as a sum of positive squares in 2 ways, for example, as 9241600 + 2896804 = 3040^2 + 1702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12138404.

It is not an unprimeable number, because it can be changed into a prime (12138409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4007 + ... + 6350.

It is an arithmetic number, because the mean of its divisors is an integer number (1776397).

Almost surely, 2^12138404 is an apocalyptic number.

It is an amenable number.

12138404 is a deficient number, since it is larger than the sum of its proper divisors (9178360).

12138404 is a wasteful number, since it uses less digits than its factorization.

12138404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10654 (or 10652 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 12138404 is about 3484.0212398893. The cubic root of 12138404 is about 229.8196696139.

The spelling of 12138404 in words is "twelve million, one hundred thirty-eight thousand, four hundred four".