2209639 has 2 divisors, whose sum is σ = 2209640. Its totient is φ = 2209638.

The previous prime is 2209631. The next prime is 2209661. The reversal of 2209639 is 9369022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2209639 - 2³ = 2209631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2209639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2209631) 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 as a sum of consecutive naturals, namely, 1104819 + 1104820.

It is an arithmetic number, because the mean of its divisors is an integer number (1104820).

2^2209639 is an apocalyptic number.

2209639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2209639 is an equidigital number, since it uses as much as digits as its factorization.

2209639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 2209639 is about 1486.4854523338. The cubic root of 2209639 is about 130.2488134207.

The spelling of 2209639 in words is "two million, two hundred nine thousand, six hundred thirty-nine".