3609729 has 12 divisors (see below), whose sum is σ = 5520996. Its totient is φ = 2264832.

The previous prime is 3609719. The next prime is 3609731. The reversal of 3609729 is 9279063.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 2169729 = 1200^2 + 1473^2 .

It is not a de Polignac number, because 3609729 - 2⁴ = 3609713 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3609693 and 3609702.

It is not an unprimeable number, because it can be changed into a prime (3609719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11644 + ... + 11949.

It is an arithmetic number, because the mean of its divisors is an integer number (460083).

Almost surely, 2^3609729 is an apocalyptic number.

It is an amenable number.

3609729 is a deficient number, since it is larger than the sum of its proper divisors (1911267).

3609729 is a wasteful number, since it uses less digits than its factorization.

3609729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23616 (or 23613 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 3609729 is about 1899.9286828721. The cubic root of 3609729 is about 153.3998257090.

The spelling of 3609729 in words is "three million, six hundred nine thousand, seven hundred twenty-nine".