3639709 has 4 divisors (see below), whose sum is σ = 3644316. Its totient is φ = 3635104.

The previous prime is 3639689. The next prime is 3639719. The reversal of 3639709 is 9079363.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9079363 = 1187 ⋅7649.

It can be written as a sum of positive squares in 2 ways, for example, as 363609 + 3276100 = 603^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639709 - 2⁹ = 3639197 is a prime.

It is a super-4 number, since 4×3639709⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639719) 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, 784 + ... + 2809.

It is an arithmetic number, because the mean of its divisors is an integer number (911079).

Almost surely, 2^3639709 is an apocalyptic number.

It is an amenable number.

3639709 is a deficient number, since it is larger than the sum of its proper divisors (4607).

3639709 is a wasteful number, since it uses less digits than its factorization.

3639709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 3639709 is about 1907.8021385878. The cubic root of 3639709 is about 153.8233342628.

The spelling of 3639709 in words is "three million, six hundred thirty-nine thousand, seven hundred nine".