339821 has 2 divisors, whose sum is σ = 339822. Its totient is φ = 339820.

The previous prime is 339817. The next prime is 339827. The reversal of 339821 is 128933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264196 + 75625 = 514^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 339821 - 2² = 339817 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 339821.

It is not a weakly prime, because it can be changed into another prime (339827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169910 + 169911.

It is an arithmetic number, because the mean of its divisors is an integer number (169911).

2³³⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

339821 is a deficient number, since it is larger than the sum of its proper divisors (1).

339821 is an equidigital number, since it uses as much as digits as its factorization.

339821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 339821 is about 582.9416780434. The cubic root of 339821 is about 69.7830699245.

The spelling of 339821 in words is "three hundred thirty-nine thousand, eight hundred twenty-one".