257947 has 2 divisors, whose sum is σ = 257948. Its totient is φ = 257946.

The previous prime is 257921. The next prime is 257953. The reversal of 257947 is 749752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257947 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (257987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128973 + 128974.

It is an arithmetic number, because the mean of its divisors is an integer number (128974).

2²⁵⁷⁹⁴⁷ is an apocalyptic number.

257947 is a deficient number, since it is larger than the sum of its proper divisors (1).

257947 is an equidigital number, since it uses as much as digits as its factorization.

257947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 257947 is about 507.8848294643. The cubic root of 257947 is about 63.6566080921.

The spelling of 257947 in words is "two hundred fifty-seven thousand, nine hundred forty-seven".