257140 has 48 divisors (see below), whose sum is σ = 620928. Its totient is φ = 88704.

The previous prime is 257123. The next prime is 257141. The reversal of 257140 is 41752.

It is a super-2 number, since 2×257140² = 132241959200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257141) 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 15 ways as a sum of consecutive naturals, for example, 5959 + ... + 6001.

It is an arithmetic number, because the mean of its divisors is an integer number (12936).

2²⁵⁷¹⁴⁰ is an apocalyptic number.

257140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310464).

257140 is an abundant number, since it is smaller than the sum of its proper divisors (363788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257140 is a wasteful number, since it uses less digits than its factorization.

257140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 257140 is about 507.0897356484. The cubic root of 257140 is about 63.5901544561.

Adding to 257140 its reverse (41752), we get a palindrome (298892).

The spelling of 257140 in words is "two hundred fifty-seven thousand, one hundred forty".