3990009 has 4 divisors (see below), whose sum is σ = 5320016. Its totient is φ = 2660004.

The previous prime is 3990001. The next prime is 3990011. The reversal of 3990009 is 9000993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9000993 = 3 ⋅3000331.

It is not a de Polignac number, because 3990009 - 2³ = 3990001 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664999 + ... + 665004.

It is an arithmetic number, because the mean of its divisors is an integer number (1330004).

Almost surely, 2^3990009 is an apocalyptic number.

It is an amenable number.

3990009 is a deficient number, since it is larger than the sum of its proper divisors (1330007).

3990009 is a wasteful number, since it uses less digits than its factorization.

3990009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330006.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 3990009 is about 1997.5006883603. The cubic root of 3990009 is about 158.6078306401.

The spelling of 3990009 in words is "three million, nine hundred ninety thousand, nine".