439021 has 8 divisors (see below), whose sum is σ = 484704. Its totient is φ = 394320.

The previous prime is 439009. The next prime is 439063. The reversal of 439021 is 120934.

It is the 271-st star number.

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

It is a cyclic number.

It is not a de Polignac number, because 439021 - 2⁵ = 438989 is a prime.

439021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 439021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439081) 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, 991 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (60588).

2⁴³⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

439021 is a deficient number, since it is larger than the sum of its proper divisors (45683).

439021 is a wasteful number, since it uses less digits than its factorization.

439021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 439021 is about 662.5865981138. The cubic root of 439021 is about 76.0025968642.

Adding to 439021 its reverse (120934), we get a palindrome (559955).

The spelling of 439021 in words is "four hundred thirty-nine thousand, twenty-one".