12439121 has 4 divisors (see below), whose sum is σ = 13170852. Its totient is φ = 11707392.

The previous prime is 12439093. The next prime is 12439123. The reversal of 12439121 is 12193421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 7756225 = 2164^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 12439121 - 2¹⁸ = 12176977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12439123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365840 + ... + 365873.

It is an arithmetic number, because the mean of its divisors is an integer number (3292713).

Almost surely, 2^12439121 is an apocalyptic number.

It is an amenable number.

12439121 is a deficient number, since it is larger than the sum of its proper divisors (731731).

12439121 is an equidigital number, since it uses as much as digits as its factorization.

12439121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731730.

The product of its digits is 432, while the sum is 23.

The square root of 12439121 is about 3526.9138067154. The cubic root of 12439121 is about 231.7020613128.

The spelling of 12439121 in words is "twelve million, four hundred thirty-nine thousand, one hundred twenty-one".