12005123 has 4 divisors (see below), whose sum is σ = 12928608. Its totient is φ = 11081640.

The previous prime is 12005099. The next prime is 12005141. The reversal of 12005123 is 32150021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12005123 - 2¹⁸ = 11742979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12005098 and 12005107.

It is not an unprimeable number, because it can be changed into a prime (12005023) 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, 461723 + ... + 461748.

It is an arithmetic number, because the mean of its divisors is an integer number (3232152).

Almost surely, 2^12005123 is an apocalyptic number.

12005123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12005123 is a deficient number, since it is larger than the sum of its proper divisors (923485).

12005123 is an equidigital number, since it uses as much as digits as its factorization.

12005123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923484.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 12005123 is about 3464.8409775919. The cubic root of 12005123 is about 228.9754237147.

Adding to 12005123 its reverse (32150021), we get a palindrome (44155144).

The spelling of 12005123 in words is "twelve million, five thousand, one hundred twenty-three".