3665965 has 24 divisors (see below), whose sum is σ = 4862880. Its totient is φ = 2650368.

The previous prime is 3665941. The next prime is 3665989. The reversal of 3665965 is 5695663.

It is an interprime number because it is at equal distance from previous prime (3665941) and next prime (3665989).

It is not a de Polignac number, because 3665965 - 2¹¹ = 3663917 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 62106 + ... + 62164.

It is an arithmetic number, because the mean of its divisors is an integer number (202620).

Almost surely, 2^3665965 is an apocalyptic number.

It is an amenable number.

3665965 is a deficient number, since it is larger than the sum of its proper divisors (1196915).

3665965 is a wasteful number, since it uses less digits than its factorization.

3665965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 124 counting only the distinct ones).

The product of its digits is 145800, while the sum is 40.

The square root of 3665965 is about 1914.6709900137. The cubic root of 3665965 is about 154.1923301161.

The spelling of 3665965 in words is "three million, six hundred sixty-five thousand, nine hundred sixty-five".