3689639 has 4 divisors (see below), whose sum is σ = 3740256. Its totient is φ = 3639024.

The previous prime is 3689633. The next prime is 3689669. The reversal of 3689639 is 9369863.

3689639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3689639 - 2²⁰ = 2641063 is a prime.

It is a super-7 number, since 7×3689639⁷ (a number of 47 digits) contains 7777777 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3689639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3689633) 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 in 3 ways as a sum of consecutive naturals, for example, 25199 + ... + 25344.

It is an arithmetic number, because the mean of its divisors is an integer number (935064).

Almost surely, 2^3689639 is an apocalyptic number.

3689639 is a deficient number, since it is larger than the sum of its proper divisors (50617).

3689639 is an equidigital number, since it uses as much as digits as its factorization.

3689639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50616.

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

The square root of 3689639 is about 1920.8433043848. The cubic root of 3689639 is about 154.5235316392.

The spelling of 3689639 in words is "three million, six hundred eighty-nine thousand, six hundred thirty-nine".