403216565 has 32 divisors (see below), whose sum is σ = 522291456. Its totient is φ = 298045440.

The previous prime is 403216549. The next prime is 403216577. The reversal of 403216565 is 565612304.

It is not a de Polignac number, because 403216565 - 2⁴ = 403216549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820970 + ... + 821460.

It is an arithmetic number, because the mean of its divisors is an integer number (16321608).

Almost surely, 2^403216565 is an apocalyptic number.

It is an amenable number.

403216565 is a deficient number, since it is larger than the sum of its proper divisors (119074891).

403216565 is a wasteful number, since it uses less digits than its factorization.

403216565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 403216565 is about 20080.2531109546. The cubic root of 403216565 is about 738.7760171513.

Adding to 403216565 its reverse (565612304), we get a palindrome (968828869).

The spelling of 403216565 in words is "four hundred three million, two hundred sixteen thousand, five hundred sixty-five".