3643421 has 8 divisors (see below), whose sum is σ = 3856320. Its totient is φ = 3432672.

The previous prime is 3643411. The next prime is 3643429. The reversal of 3643421 is 1243463.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3643421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4016 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (482040).

Almost surely, 2^3643421 is an apocalyptic number.

It is an amenable number.

3643421 is a deficient number, since it is larger than the sum of its proper divisors (212899).

3643421 is a wasteful number, since it uses less digits than its factorization.

3643421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its digits is 1728, while the sum is 23.

The square root of 3643421 is about 1908.7747378882. The cubic root of 3643421 is about 153.8756093408.

Adding to 3643421 its reverse (1243463), we get a palindrome (4886884).

The spelling of 3643421 in words is "three million, six hundred forty-three thousand, four hundred twenty-one".