257838442 has 4 divisors (see below), whose sum is σ = 386757666. Its totient is φ = 128919220.

The previous prime is 257838407. The next prime is 257838443. The reversal of 257838442 is 244838752.

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

It can be written as a sum of positive squares in only one way, i.e., 135978921 + 121859521 = 11661^2 + 11039^2 .

It is not an unprimeable number, because it can be changed into a prime (257838443) 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 as a sum of consecutive naturals, namely, 64459609 + ... + 64459612.

Almost surely, 2^257838442 is an apocalyptic number.

257838442 is a deficient number, since it is larger than the sum of its proper divisors (128919224).

257838442 is a wasteful number, since it uses less digits than its factorization.

257838442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128919223.

The product of its digits is 430080, while the sum is 43.

The square root of 257838442 is about 16057.3485357951. The cubic root of 257838442 is about 636.4767679520.

It can be divided in two parts, 25783 and 8442, that added together give a square (34225 = 185²).

The spelling of 257838442 in words is "two hundred fifty-seven million, eight hundred thirty-eight thousand, four hundred forty-two".