404555220 has 144 divisors (see below), whose sum is σ = 1336608000. Its totient is φ = 98654976.

The previous prime is 404555219. The next prime is 404555251. The reversal of 404555220 is 22555404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97141 + ... + 101219.

It is an arithmetic number, because the mean of its divisors is an integer number (9282000).

Almost surely, 2^404555220 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 404555220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668304000).

404555220 is an abundant number, since it is smaller than the sum of its proper divisors (932052780).

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

404555220 is a wasteful number, since it uses less digits than its factorization.

404555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142 (or 4137 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 404555220 is about 20113.5581138694. The cubic root of 404555220 is about 739.5926781988.

The spelling of 404555220 in words is "four hundred four million, five hundred fifty-five thousand, two hundred twenty".