12042138 has 16 divisors (see below), whose sum is σ = 24375456. Its totient is φ = 3965520.

The previous prime is 12042127. The next prime is 12042157. The reversal of 12042138 is 83124021.

It is a super-2 number, since 2×12042138² = 290026175222088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11593 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (1523466).

Almost surely, 2^12042138 is an apocalyptic number.

12042138 is an abundant number, since it is smaller than the sum of its proper divisors (12333318).

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

12042138 is a wasteful number, since it uses less digits than its factorization.

12042138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24269.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 12042138 is about 3470.1783815821. The cubic root of 12042138 is about 229.2105130575.

Adding to 12042138 its reverse (83124021), we get a palindrome (95166159).

The spelling of 12042138 in words is "twelve million, forty-two thousand, one hundred thirty-eight".