18441 has 8 divisors (see below), whose sum is σ = 27360. Its totient is φ = 12276.
The previous prime is 18439. The next prime is 18443. The reversal of 18441 is 14481.
18441 is nontrivially palindromic in base 2.
It is an interprime number because it is at equal distance from previous prime (18439) and next prime (18443).
It is not a de Polignac number, because 18441 - 21 = 18439 is a prime.
18441 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (18443) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315 + ... + 368.
It is an arithmetic number, because the mean of its divisors is an integer number (3420).
218441 is an apocalyptic number.
It is an amenable number.
18441 is a deficient number, since it is larger than the sum of its proper divisors (8919).
18441 is an equidigital number, since it uses as much as digits as its factorization.
18441 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 692 (or 686 counting only the distinct ones).
The product of its digits is 128, while the sum is 18.
The square root of 18441 is about 135.7976435731. The cubic root of 18441 is about 26.4197166760.
It can be divided in two parts, 184 and 41, that added together give a square (225 = 152).
The spelling of 18441 in words is "eighteen thousand, four hundred forty-one".
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