8404405 has 4 divisors (see below), whose sum is σ = 10085292. Its totient is φ = 6723520.

The previous prime is 8404387. The next prime is 8404411. The reversal of 8404405 is 5044048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5044516 + 3359889 = 2246^2 + 1833^2 .

It is not a de Polignac number, because 8404405 - 2¹¹ = 8402357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8404405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840436 + ... + 840445.

It is an arithmetic number, because the mean of its divisors is an integer number (2521323).

Almost surely, 2^8404405 is an apocalyptic number.

It is an amenable number.

8404405 is a deficient number, since it is larger than the sum of its proper divisors (1680887).

8404405 is a wasteful number, since it uses less digits than its factorization.

8404405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680886.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 8404405 is about 2899.0351843329. The cubic root of 8404405 is about 203.3147986928.

The spelling of 8404405 in words is "eight million, four hundred four thousand, four hundred five".