405506458909 has 4 divisors (see below), whose sum is σ = 405896745280. Its totient is φ = 405116172540.

The previous prime is 405506458891. The next prime is 405506458919. The reversal of 405506458909 is 909854605504.

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 405506458909 - 2³⁷ = 268067505437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405506458909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405506458919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195141627 + ... + 195143704.

It is an arithmetic number, because the mean of its divisors is an integer number (101474186320).

Almost surely, 2^405506458909 is an apocalyptic number.

It is an amenable number.

405506458909 is a deficient number, since it is larger than the sum of its proper divisors (390286371).

405506458909 is a wasteful number, since it uses less digits than its factorization.

405506458909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390286370.

The product of its (nonzero) digits is 7776000, while the sum is 55.

The spelling of 405506458909 in words is "four hundred five billion, five hundred six million, four hundred fifty-eight thousand, nine hundred nine".