3923221 has 4 divisors (see below), whose sum is σ = 4029292. Its totient is φ = 3817152.

The previous prime is 3923203. The next prime is 3923233. The reversal of 3923221 is 1223293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223293 = 53 ⋅23081.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 2002225 = 1386^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 3923221 - 2⁵ = 3923189 is a prime.

It is a Duffinian number.

3923221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3923192 and 3923201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3923261) 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, 52980 + ... + 53053.

It is an arithmetic number, because the mean of its divisors is an integer number (1007323).

Almost surely, 2^3923221 is an apocalyptic number.

It is an amenable number.

3923221 is a deficient number, since it is larger than the sum of its proper divisors (106071).

3923221 is a wasteful number, since it uses less digits than its factorization.

3923221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106070.

The product of its digits is 648, while the sum is 22.

The square root of 3923221 is about 1980.7122456329. The cubic root of 3923221 is about 157.7178776822.

The spelling of 3923221 in words is "three million, nine hundred twenty-three thousand, two hundred twenty-one".