383821 has 2 divisors, whose sum is σ = 383822. Its totient is φ = 383820.

The previous prime is 383813. The next prime is 383833. The reversal of 383821 is 128383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348100 + 35721 = 590^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 383821 - 2³ = 383813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (383891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191910 + 191911.

It is an arithmetic number, because the mean of its divisors is an integer number (191911).

2³⁸³⁸²¹ is an apocalyptic number.

It is an amenable number.

383821 is a deficient number, since it is larger than the sum of its proper divisors (1).

383821 is an equidigital number, since it uses as much as digits as its factorization.

383821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 383821 is about 619.5328885539. The cubic root of 383821 is about 72.6735280487.

It can be divided in two parts, 38382 and 1, that added together give a palindrome (38383).

The spelling of 383821 in words is "three hundred eighty-three thousand, eight hundred twenty-one".