3865563 has 20 divisors (see below), whose sum is σ = 6220368. Its totient is φ = 2378160.

The previous prime is 3865553. The next prime is 3865567. The reversal of 3865563 is 3655683.

3865563 is a `hidden beast` number, since 38 + 65 + 563 = 666.

It is not a de Polignac number, because 3865563 - 2¹⁷ = 3734491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3865567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 783 + ... + 2888.

Almost surely, 2^3865563 is an apocalyptic number.

3865563 is a deficient number, since it is larger than the sum of its proper divisors (2354805).

3865563 is a wasteful number, since it uses less digits than its factorization.

3865563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3687 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 3865563 is about 1966.1035069396. The cubic root of 3865563 is about 156.9414226954.

The spelling of 3865563 in words is "three million, eight hundred sixty-five thousand, five hundred sixty-three".