257857454 has 4 divisors (see below), whose sum is σ = 386786184. Its totient is φ = 128928726.

The previous prime is 257857447. The next prime is 257857459. The reversal of 257857454 is 454758752.

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 = 257857399 and 257857408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257857459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64464362 + ... + 64464365.

It is an arithmetic number, because the mean of its divisors is an integer number (96696546).

Almost surely, 2^257857454 is an apocalyptic number.

257857454 is a deficient number, since it is larger than the sum of its proper divisors (128928730).

257857454 is a wasteful number, since it uses less digits than its factorization.

257857454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128928729.

The product of its digits is 1568000, while the sum is 47.

The square root of 257857454 is about 16057.9405279756. The cubic root of 257857454 is about 636.4924113381.

The spelling of 257857454 in words is "two hundred fifty-seven million, eight hundred fifty-seven thousand, four hundred fifty-four".