404857 has 4 divisors (see below), whose sum is σ = 411556. Its totient is φ = 398160.

The previous prime is 404851. The next prime is 404941. The reversal of 404857 is 758404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9216 + 395641 = 96^2 + 629^2 .

It is a cyclic number.

It is not a de Polignac number, because 404857 - 2³ = 404849 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3258 + ... + 3379.

It is an arithmetic number, because the mean of its divisors is an integer number (102889).

2⁴⁰⁴⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

404857 is a deficient number, since it is larger than the sum of its proper divisors (6699).

404857 is an equidigital number, since it uses as much as digits as its factorization.

404857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6698.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 404857 is about 636.2837417379. The cubic root of 404857 is about 73.9776533449.

The spelling of 404857 in words is "four hundred four thousand, eight hundred fifty-seven".