409845009 has 16 divisors (see below), whose sum is σ = 626326400. Its totient is φ = 233521920.

The previous prime is 409845001. The next prime is 409845043. The reversal of 409845009 is 900548904.

It is not a de Polignac number, because 409845009 - 2³ = 409845001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409845001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20632 + ... + 35289.

It is an arithmetic number, because the mean of its divisors is an integer number (39145400).

Almost surely, 2^409845009 is an apocalyptic number.

It is an amenable number.

409845009 is a deficient number, since it is larger than the sum of its proper divisors (216481391).

409845009 is a wasteful number, since it uses less digits than its factorization.

409845009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56280.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 409845009 is about 20244.6291396014. The cubic root of 409845009 is about 742.8022608211.

The spelling of 409845009 in words is "four hundred nine million, eight hundred forty-five thousand, nine".