13640947 has 2 divisors, whose sum is σ = 13640948. Its totient is φ = 13640946.

The previous prime is 13640911. The next prime is 13640989. The reversal of 13640947 is 74904631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13640947 - 2¹¹ = 13638899 is a prime.

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is not a weakly prime, because it can be changed into another prime (13640047) 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, 6820473 + 6820474.

It is an arithmetic number, because the mean of its divisors is an integer number (6820474).

Almost surely, 2^13640947 is an apocalyptic number.

13640947 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640947 is an equidigital number, since it uses as much as digits as its factorization.

13640947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 13640947 is about 3693.3652676116. The cubic root of 13640947 is about 238.9359550154.

The spelling of 13640947 in words is "thirteen million, six hundred forty thousand, nine hundred forty-seven".