409128205 has 16 divisors (see below), whose sum is σ = 520945344. Its totient is φ = 307390720.

The previous prime is 409128193. The next prime is 409128211. The reversal of 409128205 is 502821904.

It is not a de Polignac number, because 409128205 - 2²⁷ = 274910477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36834 + ... + 46636.

It is an arithmetic number, because the mean of its divisors is an integer number (32559084).

Almost surely, 2^409128205 is an apocalyptic number.

It is an amenable number.

409128205 is a deficient number, since it is larger than the sum of its proper divisors (111817139).

409128205 is a wasteful number, since it uses less digits than its factorization.

409128205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10316.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 409128205 is about 20226.9178324331. The cubic root of 409128205 is about 742.3689634118.

The spelling of 409128205 in words is "four hundred nine million, one hundred twenty-eight thousand, two hundred five".