1981803072 has 56 divisors (see below), whose sum is σ = 5264054496. Its totient is φ = 658014208.

The previous prime is 1981803071. The next prime is 1981803091. The reversal of 1981803072 is 2703081891.

1981803072 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1981803072.

It is not an unprimeable number, because it can be changed into a prime (1981803071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29263 + ... + 69425.

Almost surely, 2^1981803072 is an apocalyptic number.

1981803072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981803072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2632027248).

1981803072 is an abundant number, since it is smaller than the sum of its proper divisors (3282251424).

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

1981803072 is a wasteful number, since it uses less digits than its factorization.

1981803072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40435 (or 40425 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1981803072 is about 44517.4468270587. The cubic root of 1981803072 is about 1256.0882867606.

The spelling of 1981803072 in words is "one billion, nine hundred eighty-one million, eight hundred three thousand, seventy-two".