240257 has 2 divisors, whose sum is σ = 240258. Its totient is φ = 240256.

The previous prime is 240209. The next prime is 240259. The reversal of 240257 is 752042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229441 + 10816 = 479^2 + 104^2 .

It is a cyclic number.

It is not a de Polignac number, because 240257 - 2¹⁰ = 239233 is a prime.

Together with 240259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (240259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120128 + 120129.

It is an arithmetic number, because the mean of its divisors is an integer number (120129).

2²⁴⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

240257 is an equidigital number, since it uses as much as digits as its factorization.

240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 240257 is about 490.1601779011. The cubic root of 240257 is about 62.1668243936.

Adding to 240257 its reverse (752042), we get a palindrome (992299).

The spelling of 240257 in words is "two hundred forty thousand, two hundred fifty-seven".