257139 has 6 divisors (see below), whose sum is σ = 371436. Its totient is φ = 171420.

The previous prime is 257123. The next prime is 257141. The reversal of 257139 is 931752.

It is not a de Polignac number, because 257139 - 2⁴ = 257123 is a prime.

It is a super-2 number, since 2×257139² = 132240930642, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁷ + 5⁷ + 1 + 7⁶ + 3⁷ + 9⁵ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 257139.

It is not an unprimeable number, because it can be changed into a prime (257189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14277 + ... + 14294.

It is an arithmetic number, because the mean of its divisors is an integer number (61906).

2²⁵⁷¹³⁹ is an apocalyptic number.

257139 is a deficient number, since it is larger than the sum of its proper divisors (114297).

257139 is a wasteful number, since it uses less digits than its factorization.

257139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28577 (or 28574 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 257139 is about 507.0887496287. The cubic root of 257139 is about 63.5900720234.

The spelling of 257139 in words is "two hundred fifty-seven thousand, one hundred thirty-nine".