47709 has 20 divisors (see below), whose sum is σ = 77440. Its totient is φ = 29160.

The previous prime is 47701. The next prime is 47711. The reversal of 47709 is 90774.

47709 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 47709 - 2³ = 47701 is a prime.

It is a super-2 number, since 2×47709² = 4552297362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1524 + ... + 1554.

It is an arithmetic number, because the mean of its divisors is an integer number (3872).

2⁴⁷⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

47709 is a deficient number, since it is larger than the sum of its proper divisors (29731).

47709 is a wasteful number, since it uses less digits than its factorization.

47709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 47709 is about 218.4238997912. The cubic root of 47709 is about 36.2688209835.

The spelling of 47709 in words is "forty-seven thousand, seven hundred nine".