404081920 has 108 divisors (see below), whose sum is σ = 1064300580. Its totient is φ = 146882560.

The previous prime is 404081903. The next prime is 404081929. The reversal of 404081920 is 29180404.

It can be written as a sum of positive squares in 2 ways, for example, as 169624576 + 234457344 = 13024^2 + 15312^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404081929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153576 + ... + 156184.

It is an arithmetic number, because the mean of its divisors is an integer number (9854635).

Almost surely, 2^404081920 is an apocalyptic number.

404081920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404081920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (532150290).

404081920 is an abundant number, since it is smaller than the sum of its proper divisors (660218660).

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

404081920 is a wasteful number, since it uses less digits than its factorization.

404081920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652 (or 2627 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 404081920 is about 20101.7889751136. The cubic root of 404081920 is about 739.3041425456.

The spelling of 404081920 in words is "four hundred four million, eighty-one thousand, nine hundred twenty".