13397729 has 2 divisors, whose sum is σ = 13397730. Its totient is φ = 13397728.

The previous prime is 13397719. The next prime is 13397803. The reversal of 13397729 is 92779331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 3157729 = 3200^2 + 1777^2 .

It is an emirp because it is prime and its reverse (92779331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13397729 - 2⁸ = 13397473 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13397719) 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, 6698864 + 6698865.

It is an arithmetic number, because the mean of its divisors is an integer number (6698865).

Almost surely, 2^13397729 is an apocalyptic number.

It is an amenable number.

13397729 is a deficient number, since it is larger than the sum of its proper divisors (1).

13397729 is an equidigital number, since it uses as much as digits as its factorization.

13397729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 41.

The square root of 13397729 is about 3660.2908354392. The cubic root of 13397729 is about 237.5073548969.

The spelling of 13397729 in words is "thirteen million, three hundred ninety-seven thousand, seven hundred twenty-nine".