404517 has 4 divisors (see below), whose sum is σ = 539360. Its totient is φ = 269676.

The previous prime is 404513. The next prime is 404527. The reversal of 404517 is 715404.

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 404517 - 2² = 404513 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404493 and 404502.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404517.

It is not an unprimeable number, because it can be changed into a prime (404513) 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, 67417 + ... + 67422.

It is an arithmetic number, because the mean of its divisors is an integer number (134840).

2⁴⁰⁴⁵¹⁷ is an apocalyptic number.

It is an amenable number.

404517 is a deficient number, since it is larger than the sum of its proper divisors (134843).

404517 is a wasteful number, since it uses less digits than its factorization.

404517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134842.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 404517 is about 636.0165092197. The cubic root of 404517 is about 73.9569386675.

Subtracting from 404517 its sum of digits (21), we obtain a square (404496 = 636²).

The spelling of 404517 in words is "four hundred four thousand, five hundred seventeen".