257085238 has 8 divisors (see below), whose sum is σ = 405924120. Its totient is φ = 121777200.

The previous prime is 257085233. The next prime is 257085259. The reversal of 257085238 is 832580752.

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

It is a self number, because there is not a number n which added to its sum of digits gives 257085238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257085233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3382663 + ... + 3382738.

It is an arithmetic number, because the mean of its divisors is an integer number (50740515).

Almost surely, 2^257085238 is an apocalyptic number.

257085238 is a deficient number, since it is larger than the sum of its proper divisors (148838882).

257085238 is a wasteful number, since it uses less digits than its factorization.

257085238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6765422.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 257085238 is about 16033.8778216625. The cubic root of 257085238 is about 635.8563996166.

The spelling of 257085238 in words is "two hundred fifty-seven million, eighty-five thousand, two hundred thirty-eight".