47665 has 4 divisors (see below), whose sum is σ = 57204. Its totient is φ = 38128.

The previous prime is 47659. The next prime is 47681. The reversal of 47665 is 56674.

47665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12321 + 35344 = 111^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 47665 - 2³ = 47657 is a prime.

It is a Duffinian number.

47665 is a lucky number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4762 + ... + 4771.

It is an arithmetic number, because the mean of its divisors is an integer number (14301).

2⁴⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

47665 is a deficient number, since it is larger than the sum of its proper divisors (9539).

47665 is an equidigital number, since it uses as much as digits as its factorization.

47665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9538.

The product of its digits is 5040, while the sum is 28.

The square root of 47665 is about 218.3231549790. The cubic root of 47665 is about 36.2576678191.

Subtracting 47665 from its reverse (56674), we obtain a palindrome (9009).

The spelling of 47665 in words is "forty-seven thousand, six hundred sixty-five".