12542939 has 2 divisors, whose sum is σ = 12542940. Its totient is φ = 12542938.

The previous prime is 12542921. The next prime is 12542947. The reversal of 12542939 is 93924521.

It is a strong prime.

It is an emirp because it is prime and its reverse (93924521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12542939 - 2¹⁶ = 12477403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12542899 and 12542908.

It is not a weakly prime, because it can be changed into another prime (12542989) by changing a digit.

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 as a sum of consecutive naturals, namely, 6271469 + 6271470.

It is an arithmetic number, because the mean of its divisors is an integer number (6271470).

Almost surely, 2^12542939 is an apocalyptic number.

12542939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12542939 is an equidigital number, since it uses as much as digits as its factorization.

12542939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 12542939 is about 3541.6011915516. The cubic root of 12542939 is about 232.3448782207.

The spelling of 12542939 in words is "twelve million, five hundred forty-two thousand, nine hundred thirty-nine".