3990309 has 4 divisors (see below), whose sum is σ = 5320416. Its totient is φ = 2660204.

The previous prime is 3990307. The next prime is 3990331. The reversal of 3990309 is 9030993.

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 3990309 - 2¹ = 3990307 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3990309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990307) 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, 665049 + ... + 665054.

It is an arithmetic number, because the mean of its divisors is an integer number (1330104).

Almost surely, 2^3990309 is an apocalyptic number.

It is an amenable number.

3990309 is a deficient number, since it is larger than the sum of its proper divisors (1330107).

3990309 is a wasteful number, since it uses less digits than its factorization.

3990309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330106.

The product of its (nonzero) digits is 6561, while the sum is 33.

The square root of 3990309 is about 1997.5757807903. The cubic root of 3990309 is about 158.6118056651.

The spelling of 3990309 in words is "three million, nine hundred ninety thousand, three hundred nine".