405999808 has 56 divisors (see below), whose sum is σ = 851164160. Its totient is φ = 191842560.

The previous prime is 405999799. The next prime is 405999871. The reversal of 405999808 is 808999504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82933 + ... + 87691.

It is an arithmetic number, because the mean of its divisors is an integer number (15199360).

Almost surely, 2^405999808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405999808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425582080).

405999808 is an abundant number, since it is smaller than the sum of its proper divisors (445164352).

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

405999808 is a wasteful number, since it uses less digits than its factorization.

405999808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4845 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 405999808 is about 20149.4369152093. The cubic root of 405999808 is about 740.4719463275.

The spelling of 405999808 in words is "four hundred five million, nine hundred ninety-nine thousand, eight hundred eight".