13928891 has 2 divisors, whose sum is σ = 13928892. Its totient is φ = 13928890.

The previous prime is 13928867. The next prime is 13928917. The reversal of 13928891 is 19882931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13928891 - 2¹⁰ = 13927867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13928791) 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, 6964445 + 6964446.

It is an arithmetic number, because the mean of its divisors is an integer number (6964446).

Almost surely, 2^13928891 is an apocalyptic number.

13928891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13928891 is an equidigital number, since it uses as much as digits as its factorization.

13928891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 13928891 is about 3732.1429501025. The cubic root of 13928891 is about 240.6054792957.

The spelling of 13928891 in words is "thirteen million, nine hundred twenty-eight thousand, eight hundred ninety-one".