257543242 has 8 divisors (see below), whose sum is σ = 421434432. Its totient is φ = 117065100.

The previous prime is 257543227. The next prime is 257543267. The reversal of 257543242 is 242345752.

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 = 257543198 and 257543207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5853234 + ... + 5853277.

It is an arithmetic number, because the mean of its divisors is an integer number (52679304).

Almost surely, 2^257543242 is an apocalyptic number.

257543242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

257543242 is a deficient number, since it is larger than the sum of its proper divisors (163891190).

257543242 is a wasteful number, since it uses less digits than its factorization.

257543242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11706524.

The product of its digits is 67200, while the sum is 34.

The square root of 257543242 is about 16048.1538502097. The cubic root of 257543242 is about 636.2337738112.

Adding to 257543242 its reverse (242345752), we get a palindrome (499888994).

The spelling of 257543242 in words is "two hundred fifty-seven million, five hundred forty-three thousand, two hundred forty-two".