3223821 has 4 divisors (see below), whose sum is σ = 4298432. Its totient is φ = 2149212.

The previous prime is 3223817. The next prime is 3223837. The reversal of 3223821 is 1283223.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3223821 - 2² = 3223817 is a prime.

It is an Ulam number.

It is a D-number.

It is the 1796-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

3223821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3223811) by changing a digit.

It is a nontrivial repunit in base 1795.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537301 + ... + 537306.

It is an arithmetic number, because the mean of its divisors is an integer number (1074608).

Almost surely, 2^3223821 is an apocalyptic number.

It is an amenable number.

3223821 is a deficient number, since it is larger than the sum of its proper divisors (1074611).

3223821 is a wasteful number, since it uses less digits than its factorization.

3223821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074610.

The product of its digits is 576, while the sum is 21.

The square root of 3223821 is about 1795.5002088555. The cubic root of 3223821 is about 147.7260118350.

The spelling of 3223821 in words is "three million, two hundred twenty-three thousand, eight hundred twenty-one".