1981445334 has 16 divisors (see below), whose sum is σ = 4323153600. Its totient is φ = 600437960.

The previous prime is 1981445309. The next prime is 1981445339. The reversal of 1981445334 is 4335441891.

It is a super-3 number, since 3×1981445334³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981445339) 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 7 ways as a sum of consecutive naturals, for example, 15010884 + ... + 15011015.

It is an arithmetic number, because the mean of its divisors is an integer number (270197100).

Almost surely, 2^1981445334 is an apocalyptic number.

1981445334 is an abundant number, since it is smaller than the sum of its proper divisors (2341708266).

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

1981445334 is a wasteful number, since it uses less digits than its factorization.

1981445334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30021915.

The product of its digits is 207360, while the sum is 42.

The square root of 1981445334 is about 44513.4286929237. The cubic root of 1981445334 is about 1256.0127028040.

The spelling of 1981445334 in words is "one billion, nine hundred eighty-one million, four hundred forty-five thousand, three hundred thirty-four".