257305142 has 8 divisors (see below), whose sum is σ = 393240096. Its totient is φ = 126225112.

The previous prime is 257305127. The next prime is 257305151. The reversal of 257305142 is 241503752.

It is a happy number.

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

It is a congruent number.

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, 1213598 + ... + 1213809.

It is an arithmetic number, because the mean of its divisors is an integer number (49155012).

Almost surely, 2^257305142 is an apocalyptic number.

257305142 is a deficient number, since it is larger than the sum of its proper divisors (135934954).

257305142 is a wasteful number, since it uses less digits than its factorization.

257305142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427462.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 257305142 is about 16040.7338360812. The cubic root of 257305142 is about 636.0376462691.

Adding to 257305142 its reverse (241503752), we get a palindrome (498808894).

The spelling of 257305142 in words is "two hundred fifty-seven million, three hundred five thousand, one hundred forty-two".