3656005 has 4 divisors (see below), whose sum is σ = 4387212. Its totient is φ = 2924800.

The previous prime is 3655987. The next prime is 3656017. The reversal of 3656005 is 5006563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5006563 = 59 ⋅84857.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 2669956 = 993^2 + 1634^2 .

It is not a de Polignac number, because 3656005 - 2⁷ = 3655877 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365596 + ... + 365605.

It is an arithmetic number, because the mean of its divisors is an integer number (1096803).

Almost surely, 2^3656005 is an apocalyptic number.

It is an amenable number.

3656005 is a deficient number, since it is larger than the sum of its proper divisors (731207).

3656005 is an equidigital number, since it uses as much as digits as its factorization.

3656005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731206.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 3656005 is about 1912.0682519199. The cubic root of 3656005 is about 154.0525625939.

The spelling of 3656005 in words is "three million, six hundred fifty-six thousand, five".