3649863 has 16 divisors (see below), whose sum is σ = 5676800. Its totient is φ = 2085048.

The previous prime is 3649831. The next prime is 3649871. The reversal of 3649863 is 3689463.

It is not a de Polignac number, because 3649863 - 2⁵ = 3649831 is a prime.

It is a Duffinian number.

3649863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745 + ... + 2802.

It is an arithmetic number, because the mean of its divisors is an integer number (354800).

Almost surely, 2^3649863 is an apocalyptic number.

3649863 is a deficient number, since it is larger than the sum of its proper divisors (2026937).

3649863 is an equidigital number, since it uses as much as digits as its factorization.

3649863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571 (or 3557 counting only the distinct ones).

The product of its digits is 93312, while the sum is 39.

The square root of 3649863 is about 1910.4614625791. The cubic root of 3649863 is about 153.9662460458.

The spelling of 3649863 in words is "three million, six hundred forty-nine thousand, eight hundred sixty-three".