257355393 has 8 divisors (see below), whose sum is σ = 345037056. Its totient is φ = 170622000.

The previous prime is 257355383. The next prime is 257355407. The reversal of 257355393 is 393553752.

It is a happy number.

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

It is not a de Polignac number, because 257355393 - 2¹⁷ = 257224321 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257355383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236433 + ... + 237518.

It is an arithmetic number, because the mean of its divisors is an integer number (43129632).

Almost surely, 2^257355393 is an apocalyptic number.

It is an amenable number.

257355393 is a deficient number, since it is larger than the sum of its proper divisors (87681663).

257355393 is a wasteful number, since it uses less digits than its factorization.

257355393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474135.

The product of its digits is 425250, while the sum is 42.

The square root of 257355393 is about 16042.3001156318. The cubic root of 257355393 is about 636.0790490527.

The spelling of 257355393 in words is "two hundred fifty-seven million, three hundred fifty-five thousand, three hundred ninety-three".