257424242 has 8 divisors (see below), whose sum is σ = 399451500. Its totient is φ = 124273744.

The previous prime is 257424241. The next prime is 257424259. The reversal of 257424242 is 242424752.

It can be written as a sum of positive squares in 2 ways, for example, as 254115481 + 3308761 = 15941^2 + 1819^2 .

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 = 257424199 and 257424208.

It is not an unprimeable number, because it can be changed into a prime (257424241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2219117 + ... + 2219232.

Almost surely, 2^257424242 is an apocalyptic number.

257424242 is a deficient number, since it is larger than the sum of its proper divisors (142027258).

257424242 is a wasteful number, since it uses less digits than its factorization.

257424242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438380.

The product of its digits is 35840, while the sum is 32.

The square root of 257424242 is about 16044.4458302554. The cubic root of 257424242 is about 636.1357663432.

Adding to 257424242 its reverse (242424752), we get a palindrome (499848994).

The spelling of 257424242 in words is "two hundred fifty-seven million, four hundred twenty-four thousand, two hundred forty-two".