257242 has 4 divisors (see below), whose sum is σ = 385866. Its totient is φ = 128620.
The previous prime is 257239. The next prime is 257249. The reversal of 257242 is 242752.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 251001 + 6241 = 501^2 + 79^2 .
It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a nialpdrome in base 8.
It is not an unprimeable number, because it can be changed into a prime (257249) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64309 + ... + 64312.
2257242 is an apocalyptic number.
257242 is a deficient number, since it is larger than the sum of its proper divisors (128624).
257242 is a wasteful number, since it uses less digits than its factorization.
257242 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 128623.
The product of its digits is 1120, while the sum is 22.
The square root of 257242 is about 507.1902995918. The cubic root of 257242 is about 63.5985614695.
Adding to 257242 its reverse (242752), we get a palindrome (499994).
The spelling of 257242 in words is "two hundred fifty-seven thousand, two hundred forty-two".
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