13404247 has 2 divisors, whose sum is σ = 13404248. Its totient is φ = 13404246.

The previous prime is 13404241. The next prime is 13404271. The reversal of 13404247 is 74240431.

It is a weak prime.

It is an emirp because it is prime and its reverse (74240431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13404247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13404241) 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, 6702123 + 6702124.

It is an arithmetic number, because the mean of its divisors is an integer number (6702124).

Almost surely, 2^13404247 is an apocalyptic number.

13404247 is a deficient number, since it is larger than the sum of its proper divisors (1).

13404247 is an equidigital number, since it uses as much as digits as its factorization.

13404247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 13404247 is about 3661.1810935817. The cubic root of 13404247 is about 237.5458644572.

Adding to 13404247 its reverse (74240431), we get a palindrome (87644678).

It can be divided in two parts, 1340424 and 7, that added together give a palindrome (1340431).

The spelling of 13404247 in words is "thirteen million, four hundred four thousand, two hundred forty-seven".