18743 has 2 divisors, whose sum is σ = 18744. Its totient is φ = 18742.
The previous prime is 18731. The next prime is 18749. The reversal of 18743 is 34781.
It is a happy number.
It is a strong prime.
It is an emirp because it is prime and its reverse (34781) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18743 - 26 = 18679 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 8.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18749) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371 + 9372.
It is an arithmetic number, because the mean of its divisors is an integer number (9372).
218743 is an apocalyptic number.
18743 is a deficient number, since it is larger than the sum of its proper divisors (1).
18743 is an equidigital number, since it uses as much as digits as its factorization.
18743 is an evil number, because the sum of its binary digits is even.
The product of its digits is 672, while the sum is 23.
The square root of 18743 is about 136.9050766042. The cubic root of 18743 is about 26.5631577692.
The spelling of 18743 in words is "eighteen thousand, seven hundred forty-three".
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