438821 has 8 divisors (see below), whose sum is σ = 471744. Its totient is φ = 406720.

The previous prime is 438793. The next prime is 438827. The reversal of 438821 is 128834.

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 438821 - 2¹⁸ = 176677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438827) 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, 1256 + ... + 1566.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁴³⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

438821 is a deficient number, since it is larger than the sum of its proper divisors (32923).

438821 is a wasteful number, since it uses less digits than its factorization.

438821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 1536, while the sum is 26.

The square root of 438821 is about 662.4356572528. The cubic root of 438821 is about 75.9910538870.

The spelling of 438821 in words is "four hundred thirty-eight thousand, eight hundred twenty-one".