257443 has 2 divisors, whose sum is σ = 257444. Its totient is φ = 257442.

The previous prime is 257437. The next prime is 257447. The reversal of 257443 is 344752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257443 - 2⁹ = 256931 is a prime.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (257447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128721 + 128722.

It is an arithmetic number, because the mean of its divisors is an integer number (128722).

2²⁵⁷⁴⁴³ is an apocalyptic number.

257443 is a deficient number, since it is larger than the sum of its proper divisors (1).

257443 is an equidigital number, since it uses as much as digits as its factorization.

257443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 25.

The square root of 257443 is about 507.3884113773. The cubic root of 257443 is about 63.6151217290.

The spelling of 257443 in words is "two hundred fifty-seven thousand, four hundred forty-three".