1881918984 has 128 divisors (see below), whose sum is σ = 5326663680. Its totient is φ = 548908800.

The previous prime is 1881918977. The next prime is 1881919003. The reversal of 1881918984 is 4898191881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1857262 + ... + 1858274.

It is an arithmetic number, because the mean of its divisors is an integer number (41614560).

Almost surely, 2^1881918984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881918984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2663331840).

1881918984 is an abundant number, since it is smaller than the sum of its proper divisors (3444744696).

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

1881918984 is a wasteful number, since it uses less digits than its factorization.

1881918984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1287 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 57.

The square root of 1881918984 is about 43381.0901661081. The cubic root of 1881918984 is about 1234.6209470113.

The spelling of 1881918984 in words is "one billion, eight hundred eighty-one million, nine hundred eighteen thousand, nine hundred eighty-four".