405244442505 has 48 divisors (see below), whose sum is σ = 765508449600. Its totient is φ = 182489586048.

The previous prime is 405244442503. The next prime is 405244442641. The reversal of 405244442505 is 505244442504.

It is not a de Polignac number, because 405244442505 - 2¹ = 405244442503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405244442503) 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 47 ways as a sum of consecutive naturals, for example, 4065330 + ... + 4163819.

It is an arithmetic number, because the mean of its divisors is an integer number (15948092700).

Almost surely, 2^405244442505 is an apocalyptic number.

It is an amenable number.

405244442505 is a deficient number, since it is larger than the sum of its proper divisors (360264007095).

405244442505 is a wasteful number, since it uses less digits than its factorization.

405244442505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229238 (or 8229231 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 39.

Subtracting 405244442505 from its reverse (505244442504), we obtain a palindrome (99999999999).

The spelling of 405244442505 in words is "four hundred five billion, two hundred forty-four million, four hundred forty-two thousand, five hundred five".