257460421 has 4 divisors (see below), whose sum is σ = 257492844. Its totient is φ = 257428000.

The previous prime is 257460403. The next prime is 257460433. The reversal of 257460421 is 124064752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 240560100 + 16900321 = 15510^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 257460421 - 2¹⁹ = 256936133 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257460481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4641 + ... + 23161.

It is an arithmetic number, because the mean of its divisors is an integer number (64373211).

Almost surely, 2^257460421 is an apocalyptic number.

It is an amenable number.

257460421 is a deficient number, since it is larger than the sum of its proper divisors (32423).

257460421 is a wasteful number, since it uses less digits than its factorization.

257460421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32422.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 257460421 is about 16045.5732524581. The cubic root of 257460421 is about 636.1655662792.

The spelling of 257460421 in words is "two hundred fifty-seven million, four hundred sixty thousand, four hundred twenty-one".