3640809 has 8 divisors (see below), whose sum is σ = 4923072. Its totient is φ = 2392880.

The previous prime is 3640807. The next prime is 3640817. The reversal of 3640809 is 9080463.

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 3640809 - 2¹ = 3640807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3640801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8334 + ... + 8759.

It is an arithmetic number, because the mean of its divisors is an integer number (615384).

Almost surely, 2^3640809 is an apocalyptic number.

It is an amenable number.

3640809 is a deficient number, since it is larger than the sum of its proper divisors (1282263).

3640809 is a wasteful number, since it uses less digits than its factorization.

3640809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17167.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 3640809 is about 1908.0904066632. The cubic root of 3640809 is about 153.8388289654.

The spelling of 3640809 in words is "three million, six hundred forty thousand, eight hundred nine".