238521 has 8 divisors (see below), whose sum is σ = 325600. Its totient is φ = 155316.

The previous prime is 238519. The next prime is 238529. The reversal of 238521 is 125832.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=43.

It is not a de Polignac number, because 238521 - 2¹ = 238519 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5526 + ... + 5568.

It is an arithmetic number, because the mean of its divisors is an integer number (40700).

2²³⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

238521 is a deficient number, since it is larger than the sum of its proper divisors (87079).

238521 is an frugal number, since it uses more digits than its factorization.

It is an anagram of its base 11 representation: 238521 = (153228)₁₁.

238521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 46 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 238521 is about 488.3861177388. The cubic root of 238521 is about 62.0167315232.

The spelling of 238521 in words is "two hundred thirty-eight thousand, five hundred twenty-one".