257401843 has 2 divisors, whose sum is σ = 257401844. Its totient is φ = 257401842.

The previous prime is 257401831. The next prime is 257401853. The reversal of 257401843 is 348104752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257401843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257401799 and 257401808.

It is not a weakly prime, because it can be changed into another prime (257401853) 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, 128700921 + 128700922.

It is an arithmetic number, because the mean of its divisors is an integer number (128700922).

Almost surely, 2^257401843 is an apocalyptic number.

257401843 is a deficient number, since it is larger than the sum of its proper divisors (1).

257401843 is an equidigital number, since it uses as much as digits as its factorization.

257401843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 257401843 is about 16043.7477853524. The cubic root of 257401843 is about 636.1173153247.

The spelling of 257401843 in words is "two hundred fifty-seven million, four hundred one thousand, eight hundred forty-three".