12542239 has 4 divisors (see below), whose sum is σ = 12974760. Its totient is φ = 12109720.

The previous prime is 12542237. The next prime is 12542251. The reversal of 12542239 is 93224521.

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 12542239 - 2¹ = 12542237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12542237) 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, 216217 + ... + 216274.

It is an arithmetic number, because the mean of its divisors is an integer number (3243690).

Almost surely, 2^12542239 is an apocalyptic number.

12542239 is a deficient number, since it is larger than the sum of its proper divisors (432521).

12542239 is an equidigital number, since it uses as much as digits as its factorization.

12542239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432520.

The product of its digits is 4320, while the sum is 28.

The square root of 12542239 is about 3541.5023648164. The cubic root of 12542239 is about 232.3405558834.

The spelling of 12542239 in words is "twelve million, five hundred forty-two thousand, two hundred thirty-nine".