239281 has 4 divisors (see below), whose sum is σ = 273472. Its totient is φ = 205092.

The previous prime is 239273. The next prime is 239287. The reversal of 239281 is 182932.

239281 = 54² + 55² + ... + 95².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 239281 - 2³ = 239273 is a prime.

It is a super-2 number, since 2×239281² = 114510793922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17085 + ... + 17098.

It is an arithmetic number, because the mean of its divisors is an integer number (68368).

2²³⁹²⁸¹ is an apocalyptic number.

It is an amenable number.

239281 is a deficient number, since it is larger than the sum of its proper divisors (34191).

239281 is an equidigital number, since it uses as much as digits as its factorization.

239281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34190.

The product of its digits is 864, while the sum is 25.

The square root of 239281 is about 489.1635718244. The cubic root of 239281 is about 62.0825297055.

The spelling of 239281 in words is "two hundred thirty-nine thousand, two hundred eighty-one".