821047318 has 16 divisors (see below), whose sum is σ = 1515780000. Its totient is φ = 324809856.

The previous prime is 821047303. The next prime is 821047379. The reversal of 821047318 is 813740128.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2255443 + ... + 2255806.

It is an arithmetic number, because the mean of its divisors is an integer number (94736250).

Almost surely, 2^821047318 is an apocalyptic number.

821047318 is a deficient number, since it is larger than the sum of its proper divisors (694732682).

821047318 is a wasteful number, since it uses less digits than its factorization.

821047318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511271.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 821047318 is about 28653.9232566851. The cubic root of 821047318 is about 936.3884803212.

The spelling of 821047318 in words is "eight hundred twenty-one million, forty-seven thousand, three hundred eighteen".