13784891 has 2 divisors, whose sum is σ = 13784892. Its totient is φ = 13784890.

The previous prime is 13784873. The next prime is 13784893. The reversal of 13784891 is 19848731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13784891 - 2¹⁴ = 13768507 is a prime.

It is a Sophie Germain prime.

Together with 13784893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13784893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6892445 + 6892446.

It is an arithmetic number, because the mean of its divisors is an integer number (6892446).

Almost surely, 2^13784891 is an apocalyptic number.

13784891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13784891 is an equidigital number, since it uses as much as digits as its factorization.

13784891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 13784891 is about 3712.8009642317. The cubic root of 13784891 is about 239.7734610028.

The spelling of 13784891 in words is "thirteen million, seven hundred eighty-four thousand, eight hundred ninety-one".