3638865 has 8 divisors (see below), whose sum is σ = 5822208. Its totient is φ = 1940720.

The previous prime is 3638851. The next prime is 3638879. The reversal of 3638865 is 5688363.

3638865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3638851) and next prime (3638879).

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

It is not a de Polignac number, because 3638865 - 2¹⁴ = 3622481 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121281 + ... + 121310.

It is an arithmetic number, because the mean of its divisors is an integer number (727776).

Almost surely, 2^3638865 is an apocalyptic number.

It is an amenable number.

3638865 is a deficient number, since it is larger than the sum of its proper divisors (2183343).

3638865 is a wasteful number, since it uses less digits than its factorization.

3638865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242599.

The product of its digits is 103680, while the sum is 39.

The square root of 3638865 is about 1907.5809288206. The cubic root of 3638865 is about 153.8114434834.

The spelling of 3638865 in words is "three million, six hundred thirty-eight thousand, eight hundred sixty-five".