3728709 has 12 divisors (see below), whose sum is σ = 5488236. Its totient is φ = 2438592.

The previous prime is 3728687. The next prime is 3728713. The reversal of 3728709 is 9078273.

3728709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 2772225 = 978^2 + 1665^2 .

It is not a de Polignac number, because 3728709 - 2¹¹ = 3726661 is a prime.

It is a Curzon number.

3728709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728719) 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 11 ways as a sum of consecutive naturals, for example, 3432 + ... + 4385.

It is an arithmetic number, because the mean of its divisors is an integer number (457353).

Almost surely, 2^3728709 is an apocalyptic number.

It is an amenable number.

3728709 is a deficient number, since it is larger than the sum of its proper divisors (1759527).

3728709 is a wasteful number, since it uses less digits than its factorization.

3728709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7876 (or 7873 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 3728709 is about 1930.9865354269. The cubic root of 3728709 is about 155.0670400252.

The spelling of 3728709 in words is "three million, seven hundred twenty-eight thousand, seven hundred nine".