821896998 has 16 divisors (see below), whose sum is σ = 1770239856. Its totient is φ = 252891360.

The previous prime is 821896993. The next prime is 821897039. The reversal of 821896998 is 899698128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821896991) 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, 5268493 + ... + 5268648.

It is an arithmetic number, because the mean of its divisors is an integer number (110639991).

Almost surely, 2^821896998 is an apocalyptic number.

821896998 is an abundant number, since it is smaller than the sum of its proper divisors (948342858).

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

821896998 is a wasteful number, since it uses less digits than its factorization.

821896998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10537159.

The product of its digits is 4478976, while the sum is 60.

The square root of 821896998 is about 28668.7460137342. The cubic root of 821896998 is about 936.7113834578.

The spelling of 821896998 in words is "eight hundred twenty-one million, eight hundred ninety-six thousand, nine hundred ninety-eight".