257295139 has 4 divisors (see below), whose sum is σ = 257327224. Its totient is φ = 257263056.

The previous prime is 257295127. The next prime is 257295161. The reversal of 257295139 is 931592752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 257295139 - 2⁹ = 257294627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257295095 and 257295104.

It is not an unprimeable number, because it can be changed into a prime (257295239) 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 3 ways as a sum of consecutive naturals, for example, 7684 + ... + 23950.

It is an arithmetic number, because the mean of its divisors is an integer number (64331806).

Almost surely, 2^257295139 is an apocalyptic number.

257295139 is a deficient number, since it is larger than the sum of its proper divisors (32085).

257295139 is a wasteful number, since it uses less digits than its factorization.

257295139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32084.

The product of its digits is 170100, while the sum is 43.

The square root of 257295139 is about 16040.4220331012. The cubic root of 257295139 is about 636.0294039581.

The spelling of 257295139 in words is "two hundred fifty-seven million, two hundred ninety-five thousand, one hundred thirty-nine".