257542042 has 8 divisors (see below), whose sum is σ = 386437716. Its totient is φ = 128729472.

The previous prime is 257542003. The next prime is 257542067. The reversal of 257542042 is 240245752.

It can be written as a sum of positive squares in 2 ways, for example, as 256992961 + 549081 = 16031^2 + 741^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 257541995 and 257542013.

It is an unprimeable number.

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, 12343 + ... + 25834.

Almost surely, 2^257542042 is an apocalyptic number.

257542042 is a deficient number, since it is larger than the sum of its proper divisors (128895674).

257542042 is a wasteful number, since it uses less digits than its factorization.

257542042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41552.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 257542042 is about 16048.1164626881. The cubic root of 257542042 is about 636.2327856513.

Adding to 257542042 its reverse (240245752), we get a palindrome (497787794).

The spelling of 257542042 in words is "two hundred fifty-seven million, five hundred forty-two thousand, forty-two".