257347 has 8 divisors (see below), whose sum is σ = 274176. Its totient is φ = 241032.

The previous prime is 257339. The next prime is 257351. The reversal of 257347 is 743752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257347 - 2³ = 257339 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (257447) 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 7 ways as a sum of consecutive naturals, for example, 1458 + ... + 1624.

It is an arithmetic number, because the mean of its divisors is an integer number (34272).

2²⁵⁷³⁴⁷ is an apocalyptic number.

257347 is a deficient number, since it is larger than the sum of its proper divisors (16829).

257347 is a wasteful number, since it uses less digits than its factorization.

257347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its digits is 5880, while the sum is 28.

The square root of 257347 is about 507.2938004746. The cubic root of 257347 is about 63.6072134270.

The spelling of 257347 in words is "two hundred fifty-seven thousand, three hundred forty-seven".