257018 has 4 divisors (see below), whose sum is σ = 385530. Its totient is φ = 128508.

The previous prime is 257017. The next prime is 257053. The reversal of 257018 is 810752.

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., 190969 + 66049 = 437^2 + 257^2 .

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 256984 and 257002.

It is not an unprimeable number, because it can be changed into a prime (257017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64253 + ... + 64256.

2²⁵⁷⁰¹⁸ is an apocalyptic number.

257018 is a deficient number, since it is larger than the sum of its proper divisors (128512).

257018 is a wasteful number, since it uses less digits than its factorization.

257018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128511.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 257018 is about 506.9694270861. The cubic root of 257018 is about 63.5800960883.

The spelling of 257018 in words is "two hundred fifty-seven thousand, eighteen".