3996809 has 8 divisors (see below), whose sum is σ = 4157760. Its totient is φ = 3837456.

The previous prime is 3996793. The next prime is 3996827. The reversal of 3996809 is 9086993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3996809 - 2⁴ = 3996793 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3996809.

It is not an unprimeable number, because it can be changed into a prime (3996869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7964 + ... + 8450.

It is an arithmetic number, because the mean of its divisors is an integer number (519720).

Almost surely, 2^3996809 is an apocalyptic number.

It is an amenable number.

3996809 is a deficient number, since it is larger than the sum of its proper divisors (160951).

3996809 is a wasteful number, since it uses less digits than its factorization.

3996809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 3996809 is about 1999.2020908352. The cubic root of 3996809 is about 158.6978823274.

The spelling of 3996809 in words is "three million, nine hundred ninety-six thousand, eight hundred nine".