2208639 has 8 divisors (see below), whose sum is σ = 2952112. Its totient is φ = 1468800.

The previous prime is 2208637. The next prime is 2208643. The reversal of 2208639 is 9368022.

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

It is not a de Polignac number, because 2208639 - 2¹ = 2208637 is a prime.

It is an Ulam number.

It is a Duffinian number.

2208639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2208637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239 + ... + 2439.

It is an arithmetic number, because the mean of its divisors is an integer number (369014).

2^2208639 is an apocalyptic number.

2208639 is a deficient number, since it is larger than the sum of its proper divisors (743473).

2208639 is a wasteful number, since it uses less digits than its factorization.

2208639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 2208639 is about 1486.1490503984. The cubic root of 2208639 is about 130.2291618748.

The spelling of 2208639 in words is "two million, two hundred eight thousand, six hundred thirty-nine".