18238 has 8 divisors (see below), whose sum is σ = 29880. Its totient is φ = 8280.

The previous prime is 18233. The next prime is 18251. The reversal of 18238 is 83281.

18238 = T₅₂ + T₅₃ + ... + T₆₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 829 = 18238 / (1 + 8 + 2 + 3 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18233) by changing a digit.

18238 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393 + ... + 436.

It is an arithmetic number, because the mean of its divisors is an integer number (3735).

2¹⁸²³⁸ is an apocalyptic number.

18238 is a deficient number, since it is larger than the sum of its proper divisors (11642).

18238 is a wasteful number, since it uses less digits than its factorization.

18238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its digits is 384, while the sum is 22.

The square root of 18238 is about 135.0481395651. The cubic root of 18238 is about 26.3224153140.

It can be divided in two parts, 18 and 238, that added together give a 8-th power (256 = 2⁸).

The spelling of 18238 in words is "eighteen thousand, two hundred thirty-eight".