5665209 has 8 divisors (see below), whose sum is σ = 8240352. Its totient is φ = 3433440.

The previous prime is 5665193. The next prime is 5665213. The reversal of 5665209 is 9025665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5665209 - 2⁴ = 5665193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 171673 = 5665209 / (5 + 6 + 6 + 5 + 2 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 5665209.

It is not an unprimeable number, because it can be changed into a prime (5665259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85804 + ... + 85869.

It is an arithmetic number, because the mean of its divisors is an integer number (1030044).

Almost surely, 2^5665209 is an apocalyptic number.

It is an amenable number.

5665209 is a deficient number, since it is larger than the sum of its proper divisors (2575143).

5665209 is a wasteful number, since it uses less digits than its factorization.

5665209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171687.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 5665209 is about 2380.1699519152. The cubic root of 5665209 is about 178.2674198621.

It can be divided in two parts, 566 and 5209, that added together give a palindrome (5775).

The spelling of 5665209 in words is "five million, six hundred sixty-five thousand, two hundred nine".