3643863 has 16 divisors (see below), whose sum is σ = 5085696. Its totient is φ = 2318400.

The previous prime is 3643859. The next prime is 3643873. The reversal of 3643863 is 3683463.

It is not a de Polignac number, because 3643863 - 2² = 3643859 is a prime.

3643863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5763 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (317856).

Almost surely, 2^3643863 is an apocalyptic number.

3643863 is a deficient number, since it is larger than the sum of its proper divisors (1441833).

3643863 is a wasteful number, since it uses less digits than its factorization.

3643863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694.

The product of its digits is 31104, while the sum is 33.

The square root of 3643863 is about 1908.8905154566. The cubic root of 3643863 is about 153.8818315396.

The spelling of 3643863 in words is "three million, six hundred forty-three thousand, eight hundred sixty-three".