5638209 has 16 divisors (see below), whose sum is σ = 7838400. Its totient is φ = 3600576.

The previous prime is 5638207. The next prime is 5638219. The reversal of 5638209 is 9028365.

It is a happy number.

It is not a de Polignac number, because 5638209 - 2¹ = 5638207 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 5638209.

It is not an unprimeable number, because it can be changed into a prime (5638207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19782 + ... + 20064.

It is an arithmetic number, because the mean of its divisors is an integer number (489900).

Almost surely, 2^5638209 is an apocalyptic number.

It is an amenable number.

5638209 is a deficient number, since it is larger than the sum of its proper divisors (2200191).

5638209 is a wasteful number, since it uses less digits than its factorization.

5638209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 5638209 is about 2374.4913139449. The cubic root of 5638209 is about 177.9837652996.

The spelling of 5638209 in words is "five million, six hundred thirty-eight thousand, two hundred nine".