3655863 has 6 divisors (see below), whose sum is σ = 5280704. Its totient is φ = 2437236.

The previous prime is 3655849. The next prime is 3655877. The reversal of 3655863 is 3685563.

It is an interprime number because it is at equal distance from previous prime (3655849) and next prime (3655877).

It is not a de Polignac number, because 3655863 - 2⁵ = 3655831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203095 + ... + 203112.

Almost surely, 2^3655863 is an apocalyptic number.

3655863 is a deficient number, since it is larger than the sum of its proper divisors (1624841).

3655863 is a wasteful number, since it uses less digits than its factorization.

3655863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406213 (or 406210 counting only the distinct ones).

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

The square root of 3655863 is about 1912.0311189936. The cubic root of 3655863 is about 154.0505680901.

The spelling of 3655863 in words is "three million, six hundred fifty-five thousand, eight hundred sixty-three".