• 238 can be written using four 4's:

238 has 8 divisors (see below), whose sum is σ = 432. Its totient is φ = 96.

The previous prime is 233. The next prime is 239. The reversal of 238 is 832.

238 is nontrivially palindromic in base 16.

238 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

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

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

238 is an undulating number in base 4.

238 is a nontrivial repdigit in base 16.

It is a plaindrome in base 8, base 10, base 12 and base 16.

It is a nialpdrome in base 3 and base 16.

It is a zygodrome in base 3 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233) by changing a digit.

238 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, 6 + ... + 22.

It is an arithmetic number, because the mean of its divisors is an integer number (54).

238 is a deficient number, since it is larger than the sum of its proper divisors (194).

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

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

The sum of its prime factors is 26.

The product of its digits is 48, while the sum is 13.

The square root of 238 is about 15.4272486205. The cubic root of 238 is about 6.1971544347.

Subtracting from 238 its sum of digits (13), we obtain a square (225 = 15^{2}).

Subtracting from 238 its product of digits (48), we obtain a triangular number (190 = T_{19}).

The spelling of 238 in words is "two hundred thirty-eight", and thus it is an aban number.

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