380821 has 4 divisors (see below), whose sum is σ = 435232. Its totient is φ = 326412.

The previous prime is 380819. The next prime is 380837. The reversal of 380821 is 128083.

380821 is nontrivially palindromic in base 6.

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: 128083 = 349 ⋅367.

It is a cyclic number.

It is not a de Polignac number, because 380821 - 2¹ = 380819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 380792 and 380801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380881) 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, 27195 + ... + 27208.

It is an arithmetic number, because the mean of its divisors is an integer number (108808).

2³⁸⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

380821 is a deficient number, since it is larger than the sum of its proper divisors (54411).

380821 is an equidigital number, since it uses as much as digits as its factorization.

380821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54410.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 380821 is about 617.1069599348. The cubic root of 380821 is about 72.4836903463.

It can be divided in two parts, 38082 and 1, that added together give a palindrome (38083).

The spelling of 380821 in words is "three hundred eighty thousand, eight hundred twenty-one".