257784342 has 16 divisors (see below), whose sum is σ = 517406832. Its totient is φ = 85621760.

The previous prime is 257784287. The next prime is 257784349. The reversal of 257784342 is 243487752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 257784294 and 257784303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257784349) 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 in 7 ways as a sum of consecutive naturals, for example, 74763 + ... + 78134.

It is an arithmetic number, because the mean of its divisors is an integer number (32337927).

Almost surely, 2^257784342 is an apocalyptic number.

257784342 is an abundant number, since it is smaller than the sum of its proper divisors (259622490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257784342 is a wasteful number, since it uses less digits than its factorization.

257784342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153183.

The product of its digits is 376320, while the sum is 42.

The square root of 257784342 is about 16055.6638604575. The cubic root of 257784342 is about 636.4322493749.

The spelling of 257784342 in words is "two hundred fifty-seven million, seven hundred eighty-four thousand, three hundred forty-two".