257042397 has 8 divisors (see below), whose sum is σ = 362883456. Its totient is φ = 161281472.

The previous prime is 257042381. The next prime is 257042419. The reversal of 257042397 is 793240752.

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

It is a cyclic number.

It is not a de Polignac number, because 257042397 - 2⁴ = 257042381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257042327) 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, 2519973 + ... + 2520074.

It is an arithmetic number, because the mean of its divisors is an integer number (45360432).

Almost surely, 2^257042397 is an apocalyptic number.

It is an amenable number.

257042397 is a deficient number, since it is larger than the sum of its proper divisors (105841059).

257042397 is a wasteful number, since it uses less digits than its factorization.

257042397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040067.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 257042397 is about 16032.5418134493. The cubic root of 257042397 is about 635.8210776906.

The spelling of 257042397 in words is "two hundred fifty-seven million, forty-two thousand, three hundred ninety-seven".