3660809 has 4 divisors (see below), whose sum is σ = 3665220. Its totient is φ = 3656400.

The previous prime is 3660799. The next prime is 3660823. The reversal of 3660809 is 9080663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 319225 + 3341584 = 565^2 + 1828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3660809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3660889) 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, 542 + ... + 2759.

It is an arithmetic number, because the mean of its divisors is an integer number (916305).

Almost surely, 2^3660809 is an apocalyptic number.

It is an amenable number.

3660809 is a deficient number, since it is larger than the sum of its proper divisors (4411).

3660809 is a wasteful number, since it uses less digits than its factorization.

3660809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 3660809 is about 1913.3240708254. The cubic root of 3660809 is about 154.1200082161.

The spelling of 3660809 in words is "three million, six hundred sixty thousand, eight hundred nine".