821388948 has 24 divisors (see below), whose sum is σ = 1928336928. Its totient is φ = 272115936.

The previous prime is 821388923. The next prime is 821388959. The reversal of 821388948 is 849883128.

It is a happy number.

821388948 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 821388948.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208011 + ... + 211922.

It is an arithmetic number, because the mean of its divisors is an integer number (80347372).

Almost surely, 2^821388948 is an apocalyptic number.

It is an amenable number.

821388948 is an abundant number, since it is smaller than the sum of its proper divisors (1106947980).

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

821388948 is a wasteful number, since it uses less digits than its factorization.

821388948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420103 (or 420101 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 821388948 is about 28659.8839495208. The cubic root of 821388948 is about 936.5183364334.

The spelling of 821388948 in words is "eight hundred twenty-one million, three hundred eighty-eight thousand, nine hundred forty-eight".