3309729 has 8 divisors (see below), whose sum is σ = 4445280. Its totient is φ = 2190336.

The previous prime is 3309721. The next prime is 3309739. The reversal of 3309729 is 9279033.

3309729 = 80² + 81² + ... + 218².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3309729 - 2³ = 3309721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3309729.

It is not an unprimeable number, because it can be changed into a prime (3309721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3552 + ... + 4385.

It is an arithmetic number, because the mean of its divisors is an integer number (555660).

Almost surely, 2^3309729 is an apocalyptic number.

It is an amenable number.

3309729 is a deficient number, since it is larger than the sum of its proper divisors (1135551).

3309729 is a wasteful number, since it uses less digits than its factorization.

3309729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8079.

The product of its (nonzero) digits is 10206, while the sum is 33.

The square root of 3309729 is about 1819.2660608058. The cubic root of 3309729 is about 149.0267207307.

The spelling of 3309729 in words is "three million, three hundred nine thousand, seven hundred twenty-nine".