438221 has 4 divisors (see below), whose sum is σ = 500832. Its totient is φ = 375612.

The previous prime is 438211. The next prime is 438223. The reversal of 438221 is 122834.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122834 = 2 ⋅61417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 438193 and 438202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438223) 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, 31295 + ... + 31308.

It is an arithmetic number, because the mean of its divisors is an integer number (125208).

2⁴³⁸²²¹ is an apocalyptic number.

It is an amenable number.

438221 is a deficient number, since it is larger than the sum of its proper divisors (62611).

438221 is an equidigital number, since it uses as much as digits as its factorization.

438221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62610.

The product of its digits is 384, while the sum is 20.

The square root of 438221 is about 661.9826281709. The cubic root of 438221 is about 75.9564038978.

The spelling of 438221 in words is "four hundred thirty-eight thousand, two hundred twenty-one".