1981858882 has 8 divisors (see below), whose sum is σ = 2976791616. Its totient is φ = 989595012.

The previous prime is 1981858873. The next prime is 1981858883. The reversal of 1981858882 is 2888581891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1981858883) 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 3 ways as a sum of consecutive naturals, for example, 665358 + ... + 668329.

It is an arithmetic number, because the mean of its divisors is an integer number (372098952).

Almost surely, 2^1981858882 is an apocalyptic number.

1981858882 is a deficient number, since it is larger than the sum of its proper divisors (994932734).

1981858882 is a wasteful number, since it uses less digits than its factorization.

1981858882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334432.

The product of its digits is 2949120, while the sum is 58.

The square root of 1981858882 is about 44518.0736555391. The cubic root of 1981858882 is about 1256.1000776444.

The spelling of 1981858882 in words is "one billion, nine hundred eighty-one million, eight hundred fifty-eight thousand, eight hundred eighty-two".