820449323 has 2 divisors, whose sum is σ = 820449324. Its totient is φ = 820449322.

The previous prime is 820449299. The next prime is 820449367. The reversal of 820449323 is 323944028.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820449323 - 2⁸ = 820449067 is a prime.

It is a super-2 number, since 2×820449323² = 1346274183222316658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (820449823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410224661 + 410224662.

It is an arithmetic number, because the mean of its divisors is an integer number (410224662).

Almost surely, 2^820449323 is an apocalyptic number.

820449323 is a deficient number, since it is larger than the sum of its proper divisors (1).

820449323 is an equidigital number, since it uses as much as digits as its factorization.

820449323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 820449323 is about 28643.4865719940. The cubic root of 820449323 is about 936.1610912226.

The spelling of 820449323 in words is "eight hundred twenty million, four hundred forty-nine thousand, three hundred twenty-three".