53709 has 4 divisors (see below), whose sum is σ = 71616. Its totient is φ = 35804.

The previous prime is 53699. The next prime is 53717. The reversal of 53709 is 90735.

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 53709 - 2⁴ = 53693 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 53709.

It is not an unprimeable number, because it can be changed into a prime (53719) 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, 8949 + ... + 8954.

It is an arithmetic number, because the mean of its divisors is an integer number (17904).

2⁵³⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

53709 is a deficient number, since it is larger than the sum of its proper divisors (17907).

53709 is a wasteful number, since it uses less digits than its factorization.

53709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17906.

The product of its (nonzero) digits is 945, while the sum is 24.

The square root of 53709 is about 231.7520226449. The cubic root of 53709 is about 37.7296134241.

The spelling of 53709 in words is "fifty-three thousand, seven hundred nine".