821313798 has 16 divisors (see below), whose sum is σ = 1729081920. Its totient is φ = 259362216.

The previous prime is 821313793. The next prime is 821313847. The reversal of 821313798 is 897313128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821313791) by changing a digit.

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, 3602140 + ... + 3602367.

It is an arithmetic number, because the mean of its divisors is an integer number (108067620).

Almost surely, 2^821313798 is an apocalyptic number.

821313798 is an abundant number, since it is smaller than the sum of its proper divisors (907768122).

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

821313798 is a wasteful number, since it uses less digits than its factorization.

821313798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7204531.

The product of its digits is 72576, while the sum is 42.

The square root of 821313798 is about 28658.5728535110. The cubic root of 821313798 is about 936.4897744472.

The spelling of 821313798 in words is "eight hundred twenty-one million, three hundred thirteen thousand, seven hundred ninety-eight".