821938344 has 32 divisors (see below), whose sum is σ = 2055784320. Its totient is φ = 273854336.

The previous prime is 821938343. The next prime is 821938349. The reversal of 821938344 is 443839128.

821938344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 821938296 and 821938305.

It is not an unprimeable number, because it can be changed into a prime (821938343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56689 + ... + 69695.

It is an arithmetic number, because the mean of its divisors is an integer number (64243260).

Almost surely, 2^821938344 is an apocalyptic number.

It is an amenable number.

821938344 is an abundant number, since it is smaller than the sum of its proper divisors (1233845976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821938344 is a wasteful number, since it uses less digits than its factorization.

821938344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15649 (or 15645 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 821938344 is about 28669.4671035232. The cubic root of 821938344 is about 936.7270904622.

The spelling of 821938344 in words is "eight hundred twenty-one million, nine hundred thirty-eight thousand, three hundred forty-four".