257542342 has 4 divisors (see below), whose sum is σ = 386313516. Its totient is φ = 128771170.

The previous prime is 257542303. The next prime is 257542349. The reversal of 257542342 is 243245752.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 257542298 and 257542307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257542349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64385584 + ... + 64385587.

It is an arithmetic number, because the mean of its divisors is an integer number (96578379).

Almost surely, 2^257542342 is an apocalyptic number.

257542342 is a deficient number, since it is larger than the sum of its proper divisors (128771174).

257542342 is a wasteful number, since it uses less digits than its factorization.

257542342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128771173.

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

The square root of 257542342 is about 16048.1258095766. The cubic root of 257542342 is about 636.2330326916.

The spelling of 257542342 in words is "two hundred fifty-seven million, five hundred forty-two thousand, three hundred forty-two".