3668643 has 12 divisors (see below), whose sum is σ = 5781048. Its totient is φ = 2223360.

The previous prime is 3668629. The next prime is 3668647. The reversal of 3668643 is 3468663.

3668643 is a `hidden beast` number, since 3 + 6 + 6 + 8 + 643 = 666.

It is not a de Polignac number, because 3668643 - 2⁵ = 3668611 is a prime.

It is a super-2 number, since 2×3668643² = 26917882922898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3668598 and 3668607.

It is not an unprimeable number, because it can be changed into a prime (3668647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18430 + ... + 18627.

It is an arithmetic number, because the mean of its divisors is an integer number (481754).

Almost surely, 2^3668643 is an apocalyptic number.

3668643 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

3668643 is a deficient number, since it is larger than the sum of its proper divisors (2112405).

3668643 is a wasteful number, since it uses less digits than its factorization.

3668643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37074 (or 37071 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 3668643 is about 1915.3701992043. The cubic root of 3668643 is about 154.2298669859.

It can be divided in two parts, 366 and 8643, that added together give a palindrome (9009).

The spelling of 3668643 in words is "three million, six hundred sixty-eight thousand, six hundred forty-three".