821882889 has 8 divisors (see below), whose sum is σ = 1217604320. Its totient is φ = 547921908.

The previous prime is 821882857. The next prime is 821882909. The reversal of 821882889 is 988288128.

It is not a de Polignac number, because 821882889 - 2⁵ = 821882857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821882389) 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, 15220027 + ... + 15220080.

It is an arithmetic number, because the mean of its divisors is an integer number (152200540).

Almost surely, 2^821882889 is an apocalyptic number.

It is an amenable number.

821882889 is a deficient number, since it is larger than the sum of its proper divisors (395721431).

821882889 is a wasteful number, since it uses less digits than its factorization.

821882889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30440116 (or 30440110 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 54.

The square root of 821882889 is about 28668.4999433176. The cubic root of 821882889 is about 936.7060234445.

The spelling of 821882889 in words is "eight hundred twenty-one million, eight hundred eighty-two thousand, eight hundred eighty-nine".