3990209 has 4 divisors (see below), whose sum is σ = 4200240. Its totient is φ = 3780180.

The previous prime is 3990187. The next prime is 3990241. The reversal of 3990209 is 9020993.

3990209 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 a cyclic number.

It is not a de Polignac number, because 3990209 - 2¹² = 3986113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990269) 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, 104987 + ... + 105024.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060).

Almost surely, 2^3990209 is an apocalyptic number.

It is an amenable number.

3990209 is a deficient number, since it is larger than the sum of its proper divisors (210031).

3990209 is a wasteful number, since it uses less digits than its factorization.

3990209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210030.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 3990209 is about 1997.5507502940. The cubic root of 3990209 is about 158.6104806789.

The spelling of 3990209 in words is "three million, nine hundred ninety thousand, two hundred nine".