404008840 has 16 divisors (see below), whose sum is σ = 909019980. Its totient is φ = 161603520.

The previous prime is 404008817. The next prime is 404008849. The reversal of 404008840 is 48800404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 398162116 + 5846724 = 19954^2 + 2418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 404008799 and 404008808.

It is not an unprimeable number, because it can be changed into a prime (404008849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050071 + ... + 5050150.

Almost surely, 2^404008840 is an apocalyptic number.

404008840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404008840 is an abundant number, since it is smaller than the sum of its proper divisors (505011140).

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

404008840 is a wasteful number, since it uses less digits than its factorization.

404008840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100232 (or 10100228 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 404008840 is about 20099.9711442579. The cubic root of 404008840 is about 739.2595710520.

The spelling of 404008840 in words is "four hundred four million, eight thousand, eight hundred forty".