5309209 has 4 divisors (see below), whose sum is σ = 5314320. Its totient is φ = 5304100.

The previous prime is 5309207. The next prime is 5309243. The reversal of 5309209 is 9029035.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5309209 - 2¹ = 5309207 is a prime.

It is a Duffinian number.

5309209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5309201) 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, 379 + ... + 3280.

It is an arithmetic number, because the mean of its divisors is an integer number (1328580).

Almost surely, 2^5309209 is an apocalyptic number.

It is an amenable number.

5309209 is a deficient number, since it is larger than the sum of its proper divisors (5111).

5309209 is a wasteful number, since it uses less digits than its factorization.

5309209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 5309209 is about 2304.1720855874. The cubic root of 5309209 is about 174.4522629222.

The spelling of 5309209 in words is "five million, three hundred nine thousand, two hundred nine".