47509 has 8 divisors (see below), whose sum is σ = 59328. Its totient is φ = 36960.

The previous prime is 47507. The next prime is 47513. The reversal of 47509 is 90574.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47509 - 2¹ = 47507 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232 + ... + 385.

It is an arithmetic number, because the mean of its divisors is an integer number (7416).

2⁴⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

47509 is a deficient number, since it is larger than the sum of its proper divisors (11819).

47509 is a wasteful number, since it uses less digits than its factorization.

47509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 47509 is about 217.9655936151. The cubic root of 47509 is about 36.2180693853.

The spelling of 47509 in words is "forty-seven thousand, five hundred nine".