344821 has 2 divisors, whose sum is σ = 344822. Its totient is φ = 344820.

The previous prime is 344819. The next prime is 344843. The reversal of 344821 is 128443.

It is an a-pointer prime, because the next prime (344843) can be obtained adding 344821 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192721 + 152100 = 439^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 344821 - 2¹ = 344819 is a prime.

Together with 344819, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 344792 and 344801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172410 + 172411.

It is an arithmetic number, because the mean of its divisors is an integer number (172411).

2³⁴⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

344821 is a deficient number, since it is larger than the sum of its proper divisors (1).

344821 is an equidigital number, since it uses as much as digits as its factorization.

344821 is an evil number, because the sum of its binary digits is even.

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

The square root of 344821 is about 587.2146115348. The cubic root of 344821 is about 70.1236589718.

The spelling of 344821 in words is "three hundred forty-four thousand, eight hundred twenty-one".