18286391 has 2 divisors, whose sum is σ = 18286392. Its totient is φ = 18286390.

The previous prime is 18286297. The next prime is 18286393. The reversal of 18286391 is 19368281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18286391 - 2¹⁰ = 18285367 is a prime.

Together with 18286393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18286393) 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, 9143195 + 9143196.

It is an arithmetic number, because the mean of its divisors is an integer number (9143196).

Almost surely, 2^18286391 is an apocalyptic number.

18286391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18286391 is an equidigital number, since it uses as much as digits as its factorization.

18286391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 18286391 is about 4276.2589958982. The cubic root of 18286391 is about 263.4567523092.

The spelling of 18286391 in words is "eighteen million, two hundred eighty-six thousand, three hundred ninety-one".