821449 has 2 divisors, whose sum is σ = 821450. Its totient is φ = 821448.

The previous prime is 821441. The next prime is 821459. The reversal of 821449 is 944128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810000 + 11449 = 900^2 + 107^2 .

It is a cyclic number.

It is not a de Polignac number, because 821449 - 2³ = 821441 is a prime.

It is not a weakly prime, because it can be changed into another prime (821441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410724 + 410725.

It is an arithmetic number, because the mean of its divisors is an integer number (410725).

2⁸²¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

821449 is a deficient number, since it is larger than the sum of its proper divisors (1).

821449 is an equidigital number, since it uses as much as digits as its factorization.

821449 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 821449 is about 906.3382370837. The cubic root of 821449 is about 93.6541158926.

The spelling of 821449 in words is "eight hundred twenty-one thousand, four hundred forty-nine".