405491405809 has 8 divisors (see below), whose sum is σ = 464107341440. Its totient is φ = 347047618176.

The previous prime is 405491405777. The next prime is 405491405821. The reversal of 405491405809 is 908504194504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 405491405809 - 2⁵ = 405491405777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405491405609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43031949 + ... + 43041370.

It is an arithmetic number, because the mean of its divisors is an integer number (58013417680).

Almost surely, 2^405491405809 is an apocalyptic number.

It is an amenable number.

405491405809 is a deficient number, since it is larger than the sum of its proper divisors (58615935631).

405491405809 is an equidigital number, since it uses as much as digits as its factorization.

405491405809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86073999.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 405491405809 in words is "four hundred five billion, four hundred ninety-one million, four hundred five thousand, eight hundred nine".