18229 has 2 divisors, whose sum is σ = 18230. Its totient is φ = 18228.

The previous prime is 18223. The next prime is 18233. The reversal of 18229 is 92281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18225 + 4 = 135^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 18229 - 2¹³ = 10037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114 + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (9115).

2¹⁸²²⁹ is an apocalyptic number.

It is an amenable number.

18229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229 is an equidigital number, since it uses as much as digits as its factorization.

18229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 18229 is about 135.0148140020. The cubic root of 18229 is about 26.3180847822.

The spelling of 18229 in words is "eighteen thousand, two hundred twenty-nine".