405016505 has 4 divisors (see below), whose sum is σ = 486019812. Its totient is φ = 324013200.

The previous prime is 405016487. The next prime is 405016529. The reversal of 405016505 is 505610504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203461696 + 201554809 = 14264^2 + 14197^2 .

It is not a de Polignac number, because 405016505 - 2¹⁶ = 404950969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40501646 + ... + 40501655.

It is an arithmetic number, because the mean of its divisors is an integer number (121504953).

Almost surely, 2^405016505 is an apocalyptic number.

It is an amenable number.

405016505 is a deficient number, since it is larger than the sum of its proper divisors (81003307).

405016505 is an equidigital number, since it uses as much as digits as its factorization.

405016505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81003306.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 405016505 is about 20125.0218633422. The cubic root of 405016505 is about 739.8736727380.

The spelling of 405016505 in words is "four hundred five million, sixteen thousand, five hundred five".