408505820 has 12 divisors (see below), whose sum is σ = 857862264. Its totient is φ = 163402320.

The previous prime is 408505819. The next prime is 408505859. The reversal of 408505820 is 28505804.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10212626 + ... + 10212665.

It is an arithmetic number, because the mean of its divisors is an integer number (71488522).

Almost surely, 2^408505820 is an apocalyptic number.

It is an amenable number.

408505820 is an abundant number, since it is smaller than the sum of its proper divisors (449356444).

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

408505820 is a wasteful number, since it uses less digits than its factorization.

408505820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20425300 (or 20425298 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 408505820 is about 20211.5269091675. The cubic root of 408505820 is about 741.9923302099.

The spelling of 408505820 in words is "four hundred eight million, five hundred five thousand, eight hundred twenty".