257438443 has 2 divisors, whose sum is σ = 257438444. Its totient is φ = 257438442.

The previous prime is 257438413. The next prime is 257438453. The reversal of 257438443 is 344834752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257438443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257438396 and 257438405.

It is not a weakly prime, because it can be changed into another prime (257438413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128719221 + 128719222.

It is an arithmetic number, because the mean of its divisors is an integer number (128719222).

Almost surely, 2^257438443 is an apocalyptic number.

257438443 is a deficient number, since it is larger than the sum of its proper divisors (1).

257438443 is an equidigital number, since it uses as much as digits as its factorization.

257438443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 40.

The square root of 257438443 is about 16044.8883760530. Note that the first 3 decimals coincide. The cubic root of 257438443 is about 636.1474637625.

The spelling of 257438443 in words is "two hundred fifty-seven million, four hundred thirty-eight thousand, four hundred forty-three".