257969 has 4 divisors (see below), whose sum is σ = 262260. Its totient is φ = 253680.

The previous prime is 257953. The next prime is 257981. The reversal of 257969 is 969752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 144400 + 113569 = 380^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 257969 - 2⁴ = 257953 is a prime.

It is a super-2 number, since 2×257969² = 133096009922, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 257969.

It is not an unprimeable number, because it can be changed into a prime (257989) 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, 2054 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (65565).

2²⁵⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

257969 is a deficient number, since it is larger than the sum of its proper divisors (4291).

257969 is an equidigital number, since it uses as much as digits as its factorization.

257969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290.

The product of its digits is 34020, while the sum is 38.

The square root of 257969 is about 507.9064874561. The cubic root of 257969 is about 63.6584177734.

The spelling of 257969 in words is "two hundred fifty-seven thousand, nine hundred sixty-nine".