449821 has 2 divisors, whose sum is σ = 449822. Its totient is φ = 449820.

The previous prime is 449807. The next prime is 449833. The reversal of 449821 is 128944.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 168921 = 530^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 449821 - 2⁷ = 449693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 449821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (449851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224910 + 224911.

It is an arithmetic number, because the mean of its divisors is an integer number (224911).

2⁴⁴⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

449821 is a deficient number, since it is larger than the sum of its proper divisors (1).

449821 is an equidigital number, since it uses as much as digits as its factorization.

449821 is an evil number, because the sum of its binary digits is even.

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

The square root of 449821 is about 670.6869612569. The cubic root of 449821 is about 76.6207811964.

The spelling of 449821 in words is "four hundred forty-nine thousand, eight hundred twenty-one".