257857459 has 2 divisors, whose sum is σ = 257857460. Its totient is φ = 257857458.

The previous prime is 257857447. The next prime is 257857469. The reversal of 257857459 is 954758752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257857459 - 2⁹ = 257856947 is a prime.

It is not a weakly prime, because it can be changed into another prime (257857429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128928729 + 128928730.

It is an arithmetic number, because the mean of its divisors is an integer number (128928730).

Almost surely, 2^257857459 is an apocalyptic number.

257857459 is a deficient number, since it is larger than the sum of its proper divisors (1).

257857459 is an equidigital number, since it uses as much as digits as its factorization.

257857459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528000, while the sum is 52.

The square root of 257857459 is about 16057.9406836618. The cubic root of 257857459 is about 636.4924154521.

The spelling of 257857459 in words is "two hundred fifty-seven million, eight hundred fifty-seven thousand, four hundred fifty-nine".