257845343 has 4 divisors (see below), whose sum is σ = 294680400. Its totient is φ = 221010288.

The previous prime is 257845253. The next prime is 257845349. The reversal of 257845343 is 343548752.

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 257845343 - 2⁸ = 257845087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257845343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257845349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18417518 + ... + 18417531.

It is an arithmetic number, because the mean of its divisors is an integer number (73670100).

Almost surely, 2^257845343 is an apocalyptic number.

257845343 is a deficient number, since it is larger than the sum of its proper divisors (36835057).

257845343 is an equidigital number, since it uses as much as digits as its factorization.

257845343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36835056.

The product of its digits is 403200, while the sum is 41.

The square root of 257845343 is about 16057.5634203948. The cubic root of 257845343 is about 636.4824462972.

The spelling of 257845343 in words is "two hundred fifty-seven million, eight hundred forty-five thousand, three hundred forty-three".