18749 has 2 divisors, whose sum is σ = 18750. Its totient is φ = 18748.
The previous prime is 18743. The next prime is 18757. The reversal of 18749 is 94781.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 16900 + 1849 = 130^2 + 43^2 .
It is an emirp because it is prime and its reverse (94781) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18749 - 28 = 18493 is a prime.
It is a Chen prime.
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 6.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18743) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9374 + 9375.
It is an arithmetic number, because the mean of its divisors is an integer number (9375).
218749 is an apocalyptic number.
It is an amenable number.
18749 is a deficient number, since it is larger than the sum of its proper divisors (1).
18749 is an equidigital number, since it uses as much as digits as its factorization.
18749 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2016, while the sum is 29.
The square root of 18749 is about 136.9269878439. The cubic root of 18749 is about 26.5659919285.
It can be divided in two parts, 18 and 749, that added together give a palindrome (767).
The spelling of 18749 in words is "eighteen thousand, seven hundred forty-nine".
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