3665646 has 24 divisors (see below), whose sum is σ = 8137584. Its totient is φ = 1191840.

The previous prime is 3665633. The next prime is 3665653. The reversal of 3665646 is 6465663.

3665646 is a `hidden beast` number, since 3 + 6 + 6 + 5 + 646 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 3¹² + 6⁴ + 6⁶ + 5⁷ + 6⁷ + 4¹⁰ + 6⁸ .

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 3665646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (339066).

Almost surely, 2^3665646 is an apocalyptic number.

3665646 is an abundant number, since it is smaller than the sum of its proper divisors (4471938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3665646 is a wasteful number, since it uses less digits than its factorization.

3665646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016 (or 5013 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 3665646 is about 1914.5876840720. The cubic root of 3665646 is about 154.1878575530.

The spelling of 3665646 in words is "three million, six hundred sixty-five thousand, six hundred forty-six".