3643943 has 4 divisors (see below), whose sum is σ = 3654240. Its totient is φ = 3633648.

The previous prime is 3643921. The next prime is 3643951. The reversal of 3643943 is 3493463.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3643943 - 2¹² = 3639847 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 (3643963) 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 3 ways as a sum of consecutive naturals, for example, 4598 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (913560).

Almost surely, 2^3643943 is an apocalyptic number.

3643943 is a deficient number, since it is larger than the sum of its proper divisors (10297).

3643943 is an equidigital number, since it uses as much as digits as its factorization.

3643943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10296.

The product of its digits is 23328, while the sum is 32.

The square root of 3643943 is about 1908.9114699221. The cubic root of 3643943 is about 153.8829576757.

The spelling of 3643943 in words is "three million, six hundred forty-three thousand, nine hundred forty-three".