821849344 has 18 divisors (see below), whose sum is σ = 1640488850. Its totient is φ = 410924544.

The previous prime is 821849341. The next prime is 821849359. The reversal of 821849344 is 443948128.

It can be written as a sum of positive squares in only one way, i.e., 471410944 + 350438400 = 21712^2 + 18720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 821849344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821849341) 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, 1604919 + ... + 1605430.

Almost surely, 2^821849344 is an apocalyptic number.

It is an amenable number.

821849344 is a deficient number, since it is larger than the sum of its proper divisors (818639506).

821849344 is an equidigital number, since it uses as much as digits as its factorization.

821849344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210365 (or 3210351 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 821849344 is about 28667.9148875533. The cubic root of 821849344 is about 936.6932794427.

The spelling of 821849344 in words is "eight hundred twenty-one million, eight hundred forty-nine thousand, three hundred forty-four".