438421 has 4 divisors (see below), whose sum is σ = 440352. Its totient is φ = 436492.

The previous prime is 438419. The next prime is 438439. The reversal of 438421 is 124834.

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: 124834 = 2 ⋅62417.

It is a cyclic number.

It is not a de Polignac number, because 438421 - 2¹ = 438419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 438392 and 438401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438401) 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, 571 + ... + 1096.

It is an arithmetic number, because the mean of its divisors is an integer number (110088).

2⁴³⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

438421 is a deficient number, since it is larger than the sum of its proper divisors (1931).

438421 is a wasteful number, since it uses less digits than its factorization.

438421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930.

The product of its digits is 768, while the sum is 22.

The square root of 438421 is about 662.1336723049. The cubic root of 438421 is about 75.9679574064.

It can be divided in two parts, 43 and 8421, that added together give a square (8464 = 92²).

The spelling of 438421 in words is "four hundred thirty-eight thousand, four hundred twenty-one".