4309 has 4 divisors (see below), whose sum is σ = 4480.
Its totient is φ = 4140.
The previous prime is 4297. The next prime is 4327. The reversal of 4309 is 9034.
It can be divided in two parts, 4 and 309, that added together give a palindrome (313).
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, and also an emirpimes, since its reverse is a distinct semiprime: 9034 = 2 ⋅4517.
It is a cyclic number.
It is not a de Polignac number, because 4309 - 29 = 3797 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 4292 and 4301.
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 4309.
It is not an unprimeable number, because it can be changed into a prime (4339) 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, 39 + ... + 100.
It is an arithmetic number, because the mean of its divisors is an integer number (1120).
It is an amenable number.
4309 is a deficient number, since it is larger than the sum of its proper divisors (171).
4309 is a wasteful number, since it uses less digits than its factorization.
4309 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 170.
The product of its (nonzero) digits is 108, while the sum is 16.
The square root of 4309 is about 65.6429737291.
The cubic root of 4309 is about 16.2726705271.
The spelling of 4309 in words is "four thousand, three hundred nine".