409509897 has 16 divisors (see below), whose sum is σ = 555821568. Its totient is φ = 268116480.

The previous prime is 409509833. The next prime is 409509911. The reversal of 409509897 is 798905904.

It is a happy number.

It is not a de Polignac number, because 409509897 - 2⁶ = 409509833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409509817) 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, 156633 + ... + 159225.

It is an arithmetic number, because the mean of its divisors is an integer number (34738848).

Almost surely, 2^409509897 is an apocalyptic number.

It is an amenable number.

409509897 is a deficient number, since it is larger than the sum of its proper divisors (146311671).

409509897 is a wasteful number, since it uses less digits than its factorization.

409509897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 409509897 is about 20236.3508815201. The cubic root of 409509897 is about 742.5997535149.

The spelling of 409509897 in words is "four hundred nine million, five hundred nine thousand, eight hundred ninety-seven".