13423939 has 2 divisors, whose sum is σ = 13423940. Its totient is φ = 13423938.

The previous prime is 13423909. The next prime is 13423957. The reversal of 13423939 is 93932431.

13423939 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13423939 is a prime.

It is not a weakly prime, because it can be changed into another prime (13423909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6711969 + 6711970.

It is an arithmetic number, because the mean of its divisors is an integer number (6711970).

Almost surely, 2^13423939 is an apocalyptic number.

13423939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13423939 is an equidigital number, since it uses as much as digits as its factorization.

13423939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 34.

The square root of 13423939 is about 3663.8694026944. The cubic root of 13423939 is about 237.6621326906.

The spelling of 13423939 in words is "thirteen million, four hundred twenty-three thousand, nine hundred thirty-nine".