3909729 has 4 divisors (see below), whose sum is σ = 5212976. Its totient is φ = 2606484.

The previous prime is 3909709. The next prime is 3909733. The reversal of 3909729 is 9279093.

3909729 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3909729 - 2¹⁹ = 3385441 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

3909729 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3909709) 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, 651619 + ... + 651624.

It is an arithmetic number, because the mean of its divisors is an integer number (1303244).

Almost surely, 2^3909729 is an apocalyptic number.

It is an amenable number.

3909729 is a deficient number, since it is larger than the sum of its proper divisors (1303247).

3909729 is a wasteful number, since it uses less digits than its factorization.

3909729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303246.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 3909729 is about 1977.3034668457. The cubic root of 3909729 is about 157.5368721936.

The spelling of 3909729 in words is "three million, nine hundred nine thousand, seven hundred twenty-nine".