257039 has 4 divisors (see below), whose sum is σ = 264024. Its totient is φ = 250056.

The previous prime is 257017. The next prime is 257053. The reversal of 257039 is 930752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257039 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256999 and 257017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437 + ... + 3510.

It is an arithmetic number, because the mean of its divisors is an integer number (66006).

2²⁵⁷⁰³⁹ is an apocalyptic number.

257039 is a deficient number, since it is larger than the sum of its proper divisors (6985).

257039 is an equidigital number, since it uses as much as digits as its factorization.

257039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6984.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 257039 is about 506.9901379711. The cubic root of 257039 is about 63.5818276734.

The spelling of 257039 in words is "two hundred fifty-seven thousand, thirty-nine".