1989821882 has 16 divisors (see below), whose sum is σ = 3203601192. Its totient is φ = 923558400.

The previous prime is 1989821857. The next prime is 1989821887. The reversal of 1989821882 is 2881289891.

It can be written as a sum of positive squares in 4 ways, for example, as 1943839921 + 45981961 = 44089^2 + 6781^2 .

It is a super-2 number, since 2×1989821882² = 7918782244172043848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1989821887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398369 + ... + 403332.

Almost surely, 2^1989821882 is an apocalyptic number.

1989821882 is a deficient number, since it is larger than the sum of its proper divisors (1213779310).

1989821882 is a wasteful number, since it uses less digits than its factorization.

1989821882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801793.

The product of its digits is 1327104, while the sum is 56.

The square root of 1989821882 is about 44607.4195846386. The cubic root of 1989821882 is about 1257.7801431910.

The spelling of 1989821882 in words is "one billion, nine hundred eighty-nine million, eight hundred twenty-one thousand, eight hundred eighty-two".