8404840 has 32 divisors (see below), whose sum is σ = 19908000. Its totient is φ = 3184704.

The previous prime is 8404819. The next prime is 8404849. The reversal of 8404840 is 484048.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8404799 and 8404808.

It is not an unprimeable number, because it can be changed into a prime (8404849) 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, 4770 + ... + 6289.

It is an arithmetic number, because the mean of its divisors is an integer number (622125).

Almost surely, 2^8404840 is an apocalyptic number.

It is an amenable number.

8404840 is an abundant number, since it is smaller than the sum of its proper divisors (11503160).

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

8404840 is a wasteful number, since it uses less digits than its factorization.

8404840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11089 (or 11085 counting only the distinct ones).

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

The square root of 8404840 is about 2899.1102083225. The cubic root of 8404840 is about 203.3183063934.

Adding to 8404840 its reverse (484048), we get a palindrome (8888888).

The spelling of 8404840 in words is "eight million, four hundred four thousand, eight hundred forty".