13247939 has 2 divisors, whose sum is σ = 13247940. Its totient is φ = 13247938.

The previous prime is 13247911. The next prime is 13247957. The reversal of 13247939 is 93974231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13247939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13247989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6623969 + 6623970.

It is an arithmetic number, because the mean of its divisors is an integer number (6623970).

Almost surely, 2^13247939 is an apocalyptic number.

13247939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13247939 is an equidigital number, since it uses as much as digits as its factorization.

13247939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 13247939 is about 3639.7718335082. The cubic root of 13247939 is about 236.6189048188.

The spelling of 13247939 in words is "thirteen million, two hundred forty-seven thousand, nine hundred thirty-nine".