13986391 has 2 divisors, whose sum is σ = 13986392. Its totient is φ = 13986390.

The previous prime is 13986389. The next prime is 13986431. The reversal of 13986391 is 19368931.

It is an a-pointer prime, because the next prime (13986431) can be obtained adding 13986391 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (19368931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13986391 - 2¹ = 13986389 is a prime.

Together with 13986389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13986311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993195 + 6993196.

It is an arithmetic number, because the mean of its divisors is an integer number (6993196).

Almost surely, 2^13986391 is an apocalyptic number.

13986391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13986391 is an equidigital number, since it uses as much as digits as its factorization.

13986391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 13986391 is about 3739.8383654912. The cubic root of 13986391 is about 240.9361067516.

The spelling of 13986391 in words is "thirteen million, nine hundred eighty-six thousand, three hundred ninety-one".