1981447284 has 12 divisors (see below), whose sum is σ = 4623377024. Its totient is φ = 660482424.

The previous prime is 1981447283. The next prime is 1981447331. The reversal of 1981447284 is 4827441891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×1981447284³ (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 (1981447283) 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 3 ways as a sum of consecutive naturals, for example, 82560292 + ... + 82560315.

Almost surely, 2^1981447284 is an apocalyptic number.

It is an amenable number.

1981447284 is an abundant number, since it is smaller than the sum of its proper divisors (2641929740).

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

1981447284 is a wasteful number, since it uses less digits than its factorization.

1981447284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165120614 (or 165120612 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 1981447284 is about 44513.4505964209. The cubic root of 1981447284 is about 1256.0131148305.

The spelling of 1981447284 in words is "one billion, nine hundred eighty-one million, four hundred forty-seven thousand, two hundred eighty-four".