404805840 has 80 divisors (see below), whose sum is σ = 1259972928. Its totient is φ = 107511808.

The previous prime is 404805839. The next prime is 404805859. The reversal of 404805840 is 48508404.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58399 + ... + 64961.

Almost surely, 2^404805840 is an apocalyptic number.

404805840 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 404805840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629986464).

404805840 is an abundant number, since it is smaller than the sum of its proper divisors (855167088).

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

404805840 is a wasteful number, since it uses less digits than its factorization.

404805840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6836 (or 6830 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 404805840 is about 20119.7872752174. The cubic root of 404805840 is about 739.7453713667.

The spelling of 404805840 in words is "four hundred four million, eight hundred five thousand, eight hundred forty".