439221 has 4 divisors (see below), whose sum is σ = 585632. Its totient is φ = 292812.

The previous prime is 439217. The next prime is 439253. The reversal of 439221 is 122934.

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 439221 - 2² = 439217 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

439221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439421) 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, 73201 + ... + 73206.

It is an arithmetic number, because the mean of its divisors is an integer number (146408).

2⁴³⁹²²¹ is an apocalyptic number.

It is an amenable number.

439221 is a deficient number, since it is larger than the sum of its proper divisors (146411).

439221 is a wasteful number, since it uses less digits than its factorization.

439221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146410.

The product of its digits is 432, while the sum is 21.

The square root of 439221 is about 662.7375045974. The cubic root of 439221 is about 76.0141363363.

The spelling of 439221 in words is "four hundred thirty-nine thousand, two hundred twenty-one".