13644391 has 2 divisors, whose sum is σ = 13644392. Its totient is φ = 13644390.

The previous prime is 13644383. The next prime is 13644403. The reversal of 13644391 is 19344631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13644391 - 2³ = 13644383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644331) 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, 6822195 + 6822196.

It is an arithmetic number, because the mean of its divisors is an integer number (6822196).

Almost surely, 2^13644391 is an apocalyptic number.

13644391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644391 is an equidigital number, since it uses as much as digits as its factorization.

13644391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 13644391 is about 3693.8314796428. The cubic root of 13644391 is about 238.9560617862.

The spelling of 13644391 in words is "thirteen million, six hundred forty-four thousand, three hundred ninety-one".