3603865 has 4 divisors (see below), whose sum is σ = 4324644. Its totient is φ = 2883088.

The previous prime is 3603857. The next prime is 3603869. The reversal of 3603865 is 5683063.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 927369 = 1636^2 + 963^2 .

It is a cyclic number.

It is not a de Polignac number, because 3603865 - 2³ = 3603857 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3603869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360382 + ... + 360391.

It is an arithmetic number, because the mean of its divisors is an integer number (1081161).

Almost surely, 2^3603865 is an apocalyptic number.

It is an amenable number.

3603865 is a deficient number, since it is larger than the sum of its proper divisors (720779).

3603865 is an equidigital number, since it uses as much as digits as its factorization.

3603865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720778.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3603865 is about 1898.3848398046. The cubic root of 3603865 is about 153.3167147501.

It can be divided in two parts, 360 and 3865, that added together give a square (4225 = 65²).

The spelling of 3603865 in words is "three million, six hundred three thousand, eight hundred sixty-five".