384421 has 4 divisors (see below), whose sum is σ = 407052. Its totient is φ = 361792.

The previous prime is 384407. The next prime is 384437. The reversal of 384421 is 124483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124483 = 281 ⋅443.

It can be written as a sum of positive squares in 2 ways, for example, as 236196 + 148225 = 486^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 384421 - 2⁹ = 383909 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 384392 and 384401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384481) 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, 11290 + ... + 11323.

It is an arithmetic number, because the mean of its divisors is an integer number (101763).

2³⁸⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

384421 is a deficient number, since it is larger than the sum of its proper divisors (22631).

384421 is a wasteful number, since it uses less digits than its factorization.

384421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22630.

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

The square root of 384421 is about 620.0169352526. The cubic root of 384421 is about 72.7113767816.

The spelling of 384421 in words is "three hundred eighty-four thousand, four hundred twenty-one".