257047 has 4 divisors (see below), whose sum is σ = 293776. Its totient is φ = 220320.

The previous prime is 257017. The next prime is 257053. The reversal of 257047 is 740752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257017) 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 3 ways as a sum of consecutive naturals, for example, 18354 + ... + 18367.

It is an arithmetic number, because the mean of its divisors is an integer number (73444).

2²⁵⁷⁰⁴⁷ is an apocalyptic number.

257047 is a deficient number, since it is larger than the sum of its proper divisors (36729).

257047 is an equidigital number, since it uses as much as digits as its factorization.

257047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36728.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 257047 is about 506.9980276096. The cubic root of 257047 is about 63.5824873001.

Adding to 257047 its reverse (740752), we get a palindrome (997799).

The spelling of 257047 in words is "two hundred fifty-seven thousand, forty-seven".