47209 has 4 divisors (see below), whose sum is σ = 50004. Its totient is φ = 44416.

The previous prime is 47207. The next prime is 47221. The reversal of 47209 is 90274.

47209 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, and also an emirpimes, since its reverse is a distinct semiprime: 90274 = 2 ⋅45137.

It can be written as a sum of positive squares in 2 ways, for example, as 21609 + 25600 = 147^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 47209 - 2¹ = 47207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47209.

It is not an unprimeable number, because it can be changed into a prime (47207) 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, 1372 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (12501).

2⁴⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

47209 is a deficient number, since it is larger than the sum of its proper divisors (2795).

47209 is a wasteful number, since it uses less digits than its factorization.

47209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 47209 is about 217.2763217656. The cubic root of 47209 is about 36.1416742348.

It can be divided in two parts, 47 and 209, that added together give a 8-th power (256 = 2⁸).

The spelling of 47209 in words is "forty-seven thousand, two hundred nine".