18381343 has 2 divisors, whose sum is σ = 18381344. Its totient is φ = 18381342.

The previous prime is 18381329. The next prime is 18381353. The reversal of 18381343 is 34318381.

It is a strong prime.

It is an emirp because it is prime and its reverse (34318381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18381343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18381353) 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, 9190671 + 9190672.

It is an arithmetic number, because the mean of its divisors is an integer number (9190672).

Almost surely, 2^18381343 is an apocalyptic number.

18381343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18381343 is an equidigital number, since it uses as much as digits as its factorization.

18381343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 18381343 is about 4287.3468485766. The cubic root of 18381343 is about 263.9119646393.

The spelling of 18381343 in words is "eighteen million, three hundred eighty-one thousand, three hundred forty-three".