47009 has 4 divisors (see below), whose sum is σ = 48660. Its totient is φ = 45360.

The previous prime is 46997. The next prime is 47017. The reversal of 47009 is 90074.

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 30625 + 16384 = 175^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 47009 - 2⁴ = 46993 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47059) 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, 782 + ... + 839.

It is an arithmetic number, because the mean of its divisors is an integer number (12165).

2⁴⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

47009 is a deficient number, since it is larger than the sum of its proper divisors (1651).

47009 is a wasteful number, since it uses less digits than its factorization.

47009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 47009 is about 216.8155898454. The cubic root of 47009 is about 36.0905641604.

The spelling of 47009 in words is "forty-seven thousand, nine".