1981173744 has 480 divisors, whose sum is σ = 6894201600. Its totient is φ = 523837440.

The previous prime is 1981173697. The next prime is 1981173749. The reversal of 1981173744 is 4473711891.

It is a self number, because there is not a number n which added to its sum of digits gives 1981173744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981173749) 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 95 ways as a sum of consecutive naturals, for example, 33579187 + ... + 33579245.

It is an arithmetic number, because the mean of its divisors is an integer number (14362920).

Almost surely, 2^1981173744 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 1981173744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3447100800).

1981173744 is an abundant number, since it is smaller than the sum of its proper divisors (4913027856).

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

1981173744 is a wasteful number, since it uses less digits than its factorization.

1981173744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 164 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 1981173744 is about 44510.3779359376. The cubic root of 1981173744 is about 1255.9553143798.

The spelling of 1981173744 in words is "one billion, nine hundred eighty-one million, one hundred seventy-three thousand, seven hundred forty-four".