40505 has 4 divisors (see below), whose sum is σ = 48612. Its totient is φ = 32400.

The previous prime is 40499. The next prime is 40507. The reversal of 40505 is 50504.

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 32041 + 8464 = 179^2 + 92^2 .

It is not a de Polignac number, because 40505 - 2¹⁴ = 24121 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 40505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4046 + ... + 4055.

It is an arithmetic number, because the mean of its divisors is an integer number (12153).

2⁴⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

40505 is a deficient number, since it is larger than the sum of its proper divisors (8107).

40505 is an equidigital number, since it uses as much as digits as its factorization.

40505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 40505 is about 201.2585401915. The cubic root of 40505 is about 34.3428404459.

Subtracting 40505 from its reverse (50504), we obtain a palindrome (9999).

It can be divided in two parts, 40 and 505, that added together give a palindrome (545).

The spelling of 40505 in words is "forty thousand, five hundred five".