257707343 has 2 divisors, whose sum is σ = 257707344. Its totient is φ = 257707342.

The previous prime is 257707337. The next prime is 257707357. The reversal of 257707343 is 343707752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257707343 - 2²⁰ = 256658767 is a prime.

It is a super-2 number, since 2×257707343² = 132826149272239298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257707297 and 257707306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257707363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128853671 + 128853672.

It is an arithmetic number, because the mean of its divisors is an integer number (128853672).

Almost surely, 2^257707343 is an apocalyptic number.

257707343 is a deficient number, since it is larger than the sum of its proper divisors (1).

257707343 is an equidigital number, since it uses as much as digits as its factorization.

257707343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 38.

The square root of 257707343 is about 16053.2658048137. The cubic root of 257707343 is about 636.3688766006.

The spelling of 257707343 in words is "two hundred fifty-seven million, seven hundred seven thousand, three hundred forty-three".