3643643 has 4 divisors (see below), whose sum is σ = 3649608. Its totient is φ = 3637680.

The previous prime is 3643639. The next prime is 3643657. The reversal of 3643643 is 3463463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3463463 = 139 ⋅24917.

It is a cyclic number.

It is not a de Polignac number, because 3643643 - 2² = 3643639 is a prime.

It is a super-2 number, since 2×3643643² = 26552268622898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946 + ... + 3327.

It is an arithmetic number, because the mean of its divisors is an integer number (912402).

Almost surely, 2^3643643 is an apocalyptic number.

3643643 is a deficient number, since it is larger than the sum of its proper divisors (5965).

3643643 is an equidigital number, since it uses as much as digits as its factorization.

3643643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964.

The product of its digits is 15552, while the sum is 29.

The square root of 3643643 is about 1908.8328894903. The cubic root of 3643643 is about 153.8787345805.

The spelling of 3643643 in words is "three million, six hundred forty-three thousand, six hundred forty-three".