257939 has 8 divisors (see below), whose sum is σ = 285120. Its totient is φ = 231400.

The previous prime is 257921. The next prime is 257947. The reversal of 257939 is 939752.

257939 = T₁₄₂ + T₁₄₃ + ... + T₁₆₃.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257899 and 257908.

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 7 ways as a sum of consecutive naturals, for example, 1352 + ... + 1530.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2²⁵⁷⁹³⁹ is an apocalyptic number.

257939 is a deficient number, since it is larger than the sum of its proper divisors (27181).

257939 is a wasteful number, since it uses less digits than its factorization.

257939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its digits is 17010, while the sum is 35.

The square root of 257939 is about 507.8769536020. The cubic root of 257939 is about 63.6559500007.

The spelling of 257939 in words is "two hundred fifty-seven thousand, nine hundred thirty-nine".