3665943 has 12 divisors (see below), whose sum is σ = 5370768. Its totient is φ = 2409120.

The previous prime is 3665941. The next prime is 3665989. The reversal of 3665943 is 3495663.

3665943 is a `hidden beast` number, since 3 + 66 + 594 + 3 = 666.

It is not a de Polignac number, because 3665943 - 2¹ = 3665941 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 3665898 and 3665907.

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 11 ways as a sum of consecutive naturals, for example, 2230 + ... + 3507.

It is an arithmetic number, because the mean of its divisors is an integer number (447564).

Almost surely, 2^3665943 is an apocalyptic number.

3665943 is a deficient number, since it is larger than the sum of its proper divisors (1704825).

3665943 is a wasteful number, since it uses less digits than its factorization.

3665943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814 (or 5811 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 3665943 is about 1914.6652448927. The cubic root of 3665943 is about 154.1920216718.

The spelling of 3665943 in words is "three million, six hundred sixty-five thousand, nine hundred forty-three".