1981084844 has 12 divisors (see below), whose sum is σ = 3479238168. Its totient is φ = 987016800.

The previous prime is 1981084793. The next prime is 1981084867. The reversal of 1981084844 is 4484801891.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880142 + ... + 882389.

It is an arithmetic number, because the mean of its divisors is an integer number (289936514).

Almost surely, 2^1981084844 is an apocalyptic number.

It is an amenable number.

1981084844 is a deficient number, since it is larger than the sum of its proper divisors (1498153324).

1981084844 is a wasteful number, since it uses less digits than its factorization.

1981084844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762816 (or 1762814 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 1981084844 is about 44509.3792812257. The cubic root of 1981084844 is about 1255.9365281934.

The spelling of 1981084844 in words is "one billion, nine hundred eighty-one million, eighty-four thousand, eight hundred forty-four".