3665949 has 8 divisors (see below), whose sum is σ = 5586240. Its totient is φ = 2094816.

The previous prime is 3665941. The next prime is 3665989. The reversal of 3665949 is 9495663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3665949 - 2³ = 3665941 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

3665949 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3665949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87264 + ... + 87305.

It is an arithmetic number, because the mean of its divisors is an integer number (698280).

Almost surely, 2^3665949 is an apocalyptic number.

It is an amenable number.

3665949 is a deficient number, since it is larger than the sum of its proper divisors (1920291).

3665949 is a wasteful number, since it uses less digits than its factorization.

3665949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174579.

The product of its digits is 174960, while the sum is 42.

The square root of 3665949 is about 1914.6668117456. Note that the first 3 decimals coincide. The cubic root of 3665949 is about 154.1921057931.

The spelling of 3665949 in words is "three million, six hundred sixty-five thousand, nine hundred forty-nine".