257435 has 4 divisors (see below), whose sum is σ = 308928. Its totient is φ = 205944.

The previous prime is 257407. The next prime is 257437. The reversal of 257435 is 534752.

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

It is a cyclic number.

It is not a de Polignac number, because 257435 - 2⁶ = 257371 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (257437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25739 + ... + 25748.

It is an arithmetic number, because the mean of its divisors is an integer number (77232).

2²⁵⁷⁴³⁵ is an apocalyptic number.

257435 is a deficient number, since it is larger than the sum of its proper divisors (51493).

257435 is an equidigital number, since it uses as much as digits as its factorization.

257435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51492.

The product of its digits is 4200, while the sum is 26.

The square root of 257435 is about 507.3805278093. The cubic root of 257435 is about 63.6144627789.

The spelling of 257435 in words is "two hundred fifty-seven thousand, four hundred thirty-five".