3639965 has 24 divisors (see below), whose sum is σ = 5171040. Its totient is φ = 2452128.

The previous prime is 3639959. The next prime is 3639967. The reversal of 3639965 is 5699363.

It is not a de Polignac number, because 3639965 - 2¹⁰ = 3638941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639967) 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 23 ways as a sum of consecutive naturals, for example, 20246 + ... + 20424.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

Almost surely, 2^3639965 is an apocalyptic number.

3639965 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3639965 is a deficient number, since it is larger than the sum of its proper divisors (1531075).

3639965 is a wasteful number, since it uses less digits than its factorization.

3639965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 274 counting only the distinct ones).

The product of its digits is 131220, while the sum is 41.

The square root of 3639965 is about 1907.8692303195. The cubic root of 3639965 is about 153.8269405814.

The spelling of 3639965 in words is "three million, six hundred thirty-nine thousand, nine hundred sixty-five".