3872909 has 4 divisors (see below), whose sum is σ = 3879804. Its totient is φ = 3866016.

The previous prime is 3872899. The next prime is 3872917. The reversal of 3872909 is 9092783.

3872909 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1974025 + 1898884 = 1405^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 3872909 - 2⁴ = 3872893 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3872929) 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, 2522 + ... + 3755.

It is an arithmetic number, because the mean of its divisors is an integer number (969951).

Almost surely, 2^3872909 is an apocalyptic number.

It is an amenable number.

3872909 is a deficient number, since it is larger than the sum of its proper divisors (6895).

3872909 is an equidigital number, since it uses as much as digits as its factorization.

3872909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 3872909 is about 1967.9707823034. The cubic root of 3872909 is about 157.0407753774.

The spelling of 3872909 in words is "three million, eight hundred seventy-two thousand, nine hundred nine".