257343247 has 6 divisors (see below), whose sum is σ = 299358528. Its totient is φ = 220579884.

The previous prime is 257343227. The next prime is 257343269. The reversal of 257343247 is 742343752.

It is not a de Polignac number, because 257343247 - 2¹⁹ = 256818959 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257343227) 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 in 5 ways as a sum of consecutive naturals, for example, 2625903 + ... + 2626000.

It is an arithmetic number, because the mean of its divisors is an integer number (49893088).

Almost surely, 2^257343247 is an apocalyptic number.

257343247 is a deficient number, since it is larger than the sum of its proper divisors (42015281).

257343247 is an equidigital number, since it uses as much as digits as its factorization.

257343247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251917 (or 5251910 counting only the distinct ones).

The product of its digits is 141120, while the sum is 37.

The square root of 257343247 is about 16041.9215494903. The cubic root of 257343247 is about 636.0690422193.

Adding to 257343247 its reverse (742343752), we get a palindrome (999686999).

The spelling of 257343247 in words is "two hundred fifty-seven million, three hundred forty-three thousand, two hundred forty-seven".