47909 has 4 divisors (see below), whose sum is σ = 50016. Its totient is φ = 45804.

The previous prime is 47903. The next prime is 47911. The reversal of 47909 is 90974.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47909 - 2⁸ = 47653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47903) 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, 1019 + ... + 1064.

It is an arithmetic number, because the mean of its divisors is an integer number (12504).

2⁴⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

47909 is a deficient number, since it is larger than the sum of its proper divisors (2107).

47909 is a wasteful number, since it uses less digits than its factorization.

47909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 47909 is about 218.8812463415. The cubic root of 47909 is about 36.3194309426.

The spelling of 47909 in words is "forty-seven thousand, nine hundred nine".