3639689 has 2 divisors, whose sum is σ = 3639690. Its totient is φ = 3639688.

The previous prime is 3639667. The next prime is 3639719. The reversal of 3639689 is 9869363.

3639689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3579664 + 60025 = 1892^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3639689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3639289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819844 + 1819845.

It is an arithmetic number, because the mean of its divisors is an integer number (1819845).

Almost surely, 2^3639689 is an apocalyptic number.

It is an amenable number.

3639689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639689 is an equidigital number, since it uses as much as digits as its factorization.

3639689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 44.

The square root of 3639689 is about 1907.7968969468. The cubic root of 3639689 is about 153.8230525121.

The spelling of 3639689 in words is "three million, six hundred thirty-nine thousand, six hundred eighty-nine".