409559805 has 12 divisors (see below), whose sum is σ = 709903740. Its totient is φ = 218431872.

The previous prime is 409559803. The next prime is 409559809. The reversal of 409559805 is 508955904.

It can be written as a sum of positive squares in 2 ways, for example, as 67272804 + 342287001 = 8202^2 + 18501^2 .

It is not a de Polignac number, because 409559805 - 2¹ = 409559803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 9101329 = 409559805 / (4 + 0 + 9 + 5 + 5 + 9 + 8 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409559803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4550620 + ... + 4550709.

It is an arithmetic number, because the mean of its divisors is an integer number (59158645).

Almost surely, 2^409559805 is an apocalyptic number.

409559805 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

409559805 is a deficient number, since it is larger than the sum of its proper divisors (300343935).

409559805 is a wasteful number, since it uses less digits than its factorization.

409559805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9101340 (or 9101337 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 409559805 is about 20237.5839714132. The cubic root of 409559805 is about 742.6299197887.

The spelling of 409559805 in words is "four hundred nine million, five hundred fifty-nine thousand, eight hundred five".