408505805 has 16 divisors (see below), whose sum is σ = 502856640. Its totient is φ = 318409728.

The previous prime is 408505781. The next prime is 408505819. The reversal of 408505805 is 508505804.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 408505805 - 2⁸ = 408505549 is a prime.

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, 93101 + ... + 97389.

It is an arithmetic number, because the mean of its divisors is an integer number (31428540).

Almost surely, 2^408505805 is an apocalyptic number.

It is an amenable number.

408505805 is a deficient number, since it is larger than the sum of its proper divisors (94350835).

408505805 is a wasteful number, since it uses less digits than its factorization.

408505805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780.

The product of its (nonzero) digits is 32000, while the sum is 35.

The square root of 408505805 is about 20211.5265380921. The cubic root of 408505805 is about 741.9923211281.

Subtracting 408505805 from its reverse (508505804), we obtain a palindrome (99999999).

The spelling of 408505805 in words is "four hundred eight million, five hundred five thousand, eight hundred five".