39505 has 4 divisors (see below), whose sum is σ = 47412. Its totient is φ = 31600.

The previous prime is 39503. The next prime is 39509. The reversal of 39505 is 50593.

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 20736 + 18769 = 144^2 + 137^2 .

It is not a de Polignac number, because 39505 - 2¹ = 39503 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3946 + ... + 3955.

It is an arithmetic number, because the mean of its divisors is an integer number (11853).

2³⁹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

39505 is a deficient number, since it is larger than the sum of its proper divisors (7907).

39505 is an equidigital number, since it uses as much as digits as its factorization.

39505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7906.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 39505 is about 198.7586476106. The cubic root of 39505 is about 34.0578599577.

The spelling of 39505 in words is "thirty-nine thousand, five hundred five".