257982947 has 4 divisors (see below), whose sum is σ = 264275256. Its totient is φ = 251690640.

The previous prime is 257982943. The next prime is 257982971. The reversal of 257982947 is 749289752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257982947 - 2² = 257982943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257982943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3146093 + ... + 3146174.

It is an arithmetic number, because the mean of its divisors is an integer number (66068814).

Almost surely, 2^257982947 is an apocalyptic number.

257982947 is a deficient number, since it is larger than the sum of its proper divisors (6292309).

257982947 is an equidigital number, since it uses as much as digits as its factorization.

257982947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6292308.

The product of its digits is 2540160, while the sum is 53.

The square root of 257982947 is about 16061.8475587337. The cubic root of 257982947 is about 636.5956497575.

The spelling of 257982947 in words is "two hundred fifty-seven million, nine hundred eighty-two thousand, nine hundred forty-seven".