13973891 has 2 divisors, whose sum is σ = 13973892. Its totient is φ = 13973890.

The previous prime is 13973887. The next prime is 13973929. The reversal of 13973891 is 19837931.

13973891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19837931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13973891 - 2² = 13973887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13973831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6986945 + 6986946.

It is an arithmetic number, because the mean of its divisors is an integer number (6986946).

Almost surely, 2^13973891 is an apocalyptic number.

13973891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13973891 is an equidigital number, since it uses as much as digits as its factorization.

13973891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 13973891 is about 3738.1667967066. The cubic root of 13973891 is about 240.8643084111.

The spelling of 13973891 in words is "thirteen million, nine hundred seventy-three thousand, eight hundred ninety-one".