404520 has 32 divisors (see below), whose sum is σ = 1213920. Its totient is φ = 107840.

The previous prime is 404513. The next prime is 404527. The reversal of 404520 is 25404.

It is an interprime number because it is at equal distance from previous prime (404513) and next prime (404527).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 404520.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404520.

It is not an unprimeable number, because it can be changed into a prime (404527) by changing a digit.

404520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1566 + ... + 1805.

It is an arithmetic number, because the mean of its divisors is an integer number (37935).

2⁴⁰⁴⁵²⁰ is an apocalyptic number.

404520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404520 is an abundant number, since it is smaller than the sum of its proper divisors (809400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404520 is a wasteful number, since it uses less digits than its factorization.

404520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385 (or 3381 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 404520 is about 636.0188676447. The cubic root of 404520 is about 73.9571214948.

Adding to 404520 its reverse (25404), we get a palindrome (429924).

It can be divided in two parts, 40 and 4520, that added together give a triangular number (4560 = T₉₅).

The spelling of 404520 in words is "four hundred four thousand, five hundred twenty".