257377847 has 2 divisors, whose sum is σ = 257377848. Its totient is φ = 257377846.

The previous prime is 257377831. The next prime is 257377853. The reversal of 257377847 is 748773752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257377847 - 2⁴ = 257377831 is a prime.

It is a super-2 number, since 2×257377847² = 132486712252710818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257377795 and 257377804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257377867) 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, 128688923 + 128688924.

It is an arithmetic number, because the mean of its divisors is an integer number (128688924).

Almost surely, 2^257377847 is an apocalyptic number.

257377847 is a deficient number, since it is larger than the sum of its proper divisors (1).

257377847 is an equidigital number, since it uses as much as digits as its factorization.

257377847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304960, while the sum is 50.

The square root of 257377847 is about 16042.9999376675. Note that the first 4 decimals coincide. The cubic root of 257377847 is about 636.0975476012.

The spelling of 257377847 in words is "two hundred fifty-seven million, three hundred seventy-seven thousand, eight hundred forty-seven".