1981347888 has 120 divisors (see below), whose sum is σ = 5722014720. Its totient is φ = 589904640.

The previous prime is 1981347881. The next prime is 1981347923. The reversal of 1981347888 is 8887431891.

It is a super-3 number, since 3×1981347888³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981347881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247533 + ... + 255411.

It is an arithmetic number, because the mean of its divisors is an integer number (47683456).

Almost surely, 2^1981347888 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 1981347888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2861007360).

1981347888 is an abundant number, since it is smaller than the sum of its proper divisors (3740666832).

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

1981347888 is a wasteful number, since it uses less digits than its factorization.

1981347888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7947 (or 7928 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 57.

The square root of 1981347888 is about 44512.3341108956. The cubic root of 1981347888 is about 1255.9921125446.

The spelling of 1981347888 in words is "one billion, nine hundred eighty-one million, three hundred forty-seven thousand, eight hundred eighty-eight".