386821 has 4 divisors (see below), whose sum is σ = 407200. Its totient is φ = 366444.

The previous prime is 386809. The next prime is 386839. The reversal of 386821 is 128683.

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.

It is a cyclic number.

It is not a de Polignac number, because 386821 - 2⁷ = 386693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 386821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386851) 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, 10161 + ... + 10198.

It is an arithmetic number, because the mean of its divisors is an integer number (101800).

2³⁸⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

386821 is a deficient number, since it is larger than the sum of its proper divisors (20379).

386821 is a wasteful number, since it uses less digits than its factorization.

386821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20378.

The product of its digits is 2304, while the sum is 28.

The square root of 386821 is about 621.9493548513. The cubic root of 386821 is about 72.8623791114.

It can be divided in two parts, 38682 and 1, that added together give a palindrome (38683).

The spelling of 386821 in words is "three hundred eighty-six thousand, eight hundred twenty-one".