257015 has 8 divisors (see below), whose sum is σ = 336528. Its totient is φ = 186880.

The previous prime is 257003. The next prime is 257017. The reversal of 257015 is 510752.

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

It is not a de Polignac number, because 257015 - 2¹² = 252919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 257015.

It is not an unprimeable number, because it can be changed into a prime (257017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (42066).

2²⁵⁷⁰¹⁵ is an apocalyptic number.

257015 is a deficient number, since it is larger than the sum of its proper divisors (79513).

257015 is a wasteful number, since it uses less digits than its factorization.

257015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 257015 is about 506.9664683192. The cubic root of 257015 is about 63.5798487113.

Adding to 257015 its reverse (510752), we get a palindrome (767767).

The spelling of 257015 in words is "two hundred fifty-seven thousand, fifteen".