404031220 has 24 divisors (see below), whose sum is σ = 869161608. Its totient is φ = 157670400.

The previous prime is 404031211. The next prime is 404031227. The reversal of 404031220 is 22130404.

It can be written as a sum of positive squares in 4 ways, for example, as 2910436 + 401120784 = 1706^2 + 20028^2 .

It is a junction number, because it is equal to n+sod(n) for n = 404031194 and 404031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404031227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245541 + ... + 247180.

It is an arithmetic number, because the mean of its divisors is an integer number (36215067).

Almost surely, 2^404031220 is an apocalyptic number.

It is an amenable number.

404031220 is an abundant number, since it is smaller than the sum of its proper divisors (465130388).

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

404031220 is a wasteful number, since it uses less digits than its factorization.

404031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492771 (or 492769 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 404031220 is about 20100.5278537654. The cubic root of 404031220 is about 739.2732211854.

Adding to 404031220 its reverse (22130404), we get a palindrome (426161624).

The spelling of 404031220 in words is "four hundred four million, thirty-one thousand, two hundred twenty".