404257 has 4 divisors (see below), whose sum is σ = 462016. Its totient is φ = 346500.

The previous prime is 404251. The next prime is 404267. The reversal of 404257 is 752404.

404257 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 404257 - 2³ = 404249 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404257.

It is not an unprimeable number, because it can be changed into a prime (404251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28869 + ... + 28882.

It is an arithmetic number, because the mean of its divisors is an integer number (115504).

2⁴⁰⁴²⁵⁷ is an apocalyptic number.

It is an amenable number.

404257 is a deficient number, since it is larger than the sum of its proper divisors (57759).

404257 is an equidigital number, since it uses as much as digits as its factorization.

404257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57758.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 404257 is about 635.8120791555. The cubic root of 404257 is about 73.9410901987.

The spelling of 404257 in words is "four hundred four thousand, two hundred fifty-seven".