257347042 has 4 divisors (see below), whose sum is σ = 386020566. Its totient is φ = 128673520.

The previous prime is 257347033. The next prime is 257347049. The reversal of 257347042 is 240743752.

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., 214300321 + 43046721 = 14639^2 + 6561^2 .

It is a super-2 number, since 2×257347042² = 132455000052299528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257346989 and 257347007.

It is not an unprimeable number, because it can be changed into a prime (257347049) 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, 64336759 + ... + 64336762.

Almost surely, 2^257347042 is an apocalyptic number.

257347042 is a deficient number, since it is larger than the sum of its proper divisors (128673524).

257347042 is a wasteful number, since it uses less digits than its factorization.

257347042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128673523.

The product of its (nonzero) digits is 47040, while the sum is 34.

The square root of 257347042 is about 16042.0398328891. The cubic root of 257347042 is about 636.0721688736.

The spelling of 257347042 in words is "two hundred fifty-seven million, three hundred forty-seven thousand, forty-two".