3655409 has 4 divisors (see below), whose sum is σ = 3701760. Its totient is φ = 3609060.

The previous prime is 3655397. The next prime is 3655411. The reversal of 3655409 is 9045563.

It is a happy number.

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 3655409 - 2²⁰ = 2606833 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 (3655469) 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, 23057 + ... + 23214.

It is an arithmetic number, because the mean of its divisors is an integer number (925440).

Almost surely, 2^3655409 is an apocalyptic number.

It is an amenable number.

3655409 is a deficient number, since it is larger than the sum of its proper divisors (46351).

3655409 is an equidigital number, since it uses as much as digits as its factorization.

3655409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46350.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 3655409 is about 1911.9123933905. The cubic root of 3655409 is about 154.0441909499.

The spelling of 3655409 in words is "three million, six hundred fifty-five thousand, four hundred nine".