13972813 has 2 divisors, whose sum is σ = 13972814. Its totient is φ = 13972812.

The previous prime is 13972811. The next prime is 13972817. The reversal of 13972813 is 31827931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13972644 + 169 = 3738^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 13972813 - 2¹ = 13972811 is a prime.

Together with 13972811, 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 (13972811) 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, 6986406 + 6986407.

It is an arithmetic number, because the mean of its divisors is an integer number (6986407).

Almost surely, 2^13972813 is an apocalyptic number.

It is an amenable number.

13972813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13972813 is an equidigital number, since it uses as much as digits as its factorization.

13972813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 13972813 is about 3738.0226056031. The cubic root of 13972813 is about 240.8581145170.

The spelling of 13972813 in words is "thirteen million, nine hundred seventy-two thousand, eight hundred thirteen".