13966391 has 2 divisors, whose sum is σ = 13966392. Its totient is φ = 13966390.

The previous prime is 13966369. The next prime is 13966409. The reversal of 13966391 is 19366931.

It is a strong prime.

It is an emirp because it is prime and its reverse (19366931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13966391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13966321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6983195 + 6983196.

It is an arithmetic number, because the mean of its divisors is an integer number (6983196).

Almost surely, 2^13966391 is an apocalyptic number.

13966391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13966391 is an equidigital number, since it uses as much as digits as its factorization.

13966391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 13966391 is about 3737.1634965572. The cubic root of 13966391 is about 240.8212088526.

The spelling of 13966391 in words is "thirteen million, nine hundred sixty-six thousand, three hundred ninety-one".