257861438 has 4 divisors (see below), whose sum is σ = 386792160. Its totient is φ = 128930718.

The previous prime is 257861437. The next prime is 257861449. The reversal of 257861438 is 834168752.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257861437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64465358 + ... + 64465361.

It is an arithmetic number, because the mean of its divisors is an integer number (96698040).

Almost surely, 2^257861438 is an apocalyptic number.

257861438 is a deficient number, since it is larger than the sum of its proper divisors (128930722).

257861438 is a wasteful number, since it uses less digits than its factorization.

257861438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128930721.

The product of its digits is 322560, while the sum is 44.

The square root of 257861438 is about 16058.0645782734. The cubic root of 257861438 is about 636.4956893414.

The spelling of 257861438 in words is "two hundred fifty-seven million, eight hundred sixty-one thousand, four hundred thirty-eight".