405404505 has 24 divisors (see below), whose sum is σ = 766584000. Its totient is φ = 196559520.

The previous prime is 405404479. The next prime is 405404507. The reversal of 405404505 is 505404504.

It is not a de Polignac number, because 405404505 - 2⁹ = 405403993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405404507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409005 + ... + 409994.

It is an arithmetic number, because the mean of its divisors is an integer number (31941000).

Almost surely, 2^405404505 is an apocalyptic number.

405404505 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

405404505 is a deficient number, since it is larger than the sum of its proper divisors (361179495).

405404505 is a wasteful number, since it uses less digits than its factorization.

405404505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819021 (or 819018 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 405404505 is about 20134.6592968443. The cubic root of 405404505 is about 740.1098601199.

Subtracting 405404505 from its reverse (505404504), we obtain a palindrome (99999999).

The spelling of 405404505 in words is "four hundred five million, four hundred four thousand, five hundred five".