405240205609 has 4 divisors (see below), whose sum is σ = 406309441360. Its totient is φ = 404170969860.

The previous prime is 405240205583. The next prime is 405240205631. The reversal of 405240205609 is 906502042504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405240205609 - 2²⁵ = 405206651177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405240205639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534617307 + ... + 534618064.

It is an arithmetic number, because the mean of its divisors is an integer number (101577360340).

Almost surely, 2^405240205609 is an apocalyptic number.

It is an amenable number.

405240205609 is a deficient number, since it is larger than the sum of its proper divisors (1069235751).

405240205609 is a wasteful number, since it uses less digits than its factorization.

405240205609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069235750.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 405240205609 in words is "four hundred five billion, two hundred forty million, two hundred five thousand, six hundred nine".