2204639 has 4 divisors (see below), whose sum is σ = 2216256. Its totient is φ = 2193024.

The previous prime is 2204623. The next prime is 2204647. The reversal of 2204639 is 9364022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9364022 = 2 ⋅4682011.

It is a cyclic number.

It is not a de Polignac number, because 2204639 - 2⁴ = 2204623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2204659) 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 3 ways as a sum of consecutive naturals, for example, 5519 + ... + 5904.

It is an arithmetic number, because the mean of its divisors is an integer number (554064).

2^2204639 is an apocalyptic number.

2204639 is a deficient number, since it is larger than the sum of its proper divisors (11617).

2204639 is a wasteful number, since it uses less digits than its factorization.

2204639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11616.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2204639 is about 1484.8026804933. The cubic root of 2204639 is about 130.1504963200.

The spelling of 2204639 in words is "two million, two hundred four thousand, six hundred thirty-nine".