257395 has 4 divisors (see below), whose sum is σ = 308880. Its totient is φ = 205912.

The previous prime is 257381. The next prime is 257399. The reversal of 257395 is 593752.

It is a happy number.

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 257395 - 2¹⁷ = 126323 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257399) 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, 25735 + ... + 25744.

It is an arithmetic number, because the mean of its divisors is an integer number (77220).

2²⁵⁷³⁹⁵ is an apocalyptic number.

257395 is a deficient number, since it is larger than the sum of its proper divisors (51485).

257395 is an equidigital number, since it uses as much as digits as its factorization.

257395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51484.

The product of its digits is 9450, while the sum is 31.

The square root of 257395 is about 507.3411081314. The cubic root of 257395 is about 63.6111678238.

The spelling of 257395 in words is "two hundred fifty-seven thousand, three hundred ninety-five".