404503220 has 96 divisors (see below), whose sum is σ = 953285760. Its totient is φ = 142940160.

The previous prime is 404503213. The next prime is 404503243. The reversal of 404503220 is 22305404.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 404503192 and 404503201.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1429199 + ... + 1429481.

It is an arithmetic number, because the mean of its divisors is an integer number (9930060).

Almost surely, 2^404503220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404503220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476642880).

404503220 is an abundant number, since it is smaller than the sum of its proper divisors (548782540).

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

404503220 is a wasteful number, since it uses less digits than its factorization.

404503220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 404503220 is about 20112.2654119321. The cubic root of 404503220 is about 739.5609886912.

Adding to 404503220 its reverse (22305404), we get a palindrome (426808624).

The spelling of 404503220 in words is "four hundred four million, five hundred three thousand, two hundred twenty".