409929805 has 16 divisors (see below), whose sum is σ = 514583424. Its totient is φ = 312903360.

The previous prime is 409929799. The next prime is 409929809. The reversal of 409929805 is 508929904.

It is not a de Polignac number, because 409929805 - 2⁹ = 409929293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409929809) by changing a digit.

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, 44182 + ... + 52648.

It is an arithmetic number, because the mean of its divisors is an integer number (32161464).

Almost surely, 2^409929805 is an apocalyptic number.

It is an amenable number.

409929805 is a deficient number, since it is larger than the sum of its proper divisors (104653619).

409929805 is a wasteful number, since it uses less digits than its factorization.

409929805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 409929805 is about 20246.7233151441. The cubic root of 409929805 is about 742.8534853212.

Subtracting 409929805 from its reverse (508929904), we obtain a palindrome (99000099).

The spelling of 409929805 in words is "four hundred nine million, nine hundred twenty-nine thousand, eight hundred five".