1984811921 has 12 divisors (see below), whose sum is σ = 2055510000. Its totient is φ = 1916473320.

The previous prime is 1984811911. The next prime is 1984811923. The reversal of 1984811921 is 1291184891.

It is not a de Polignac number, because 1984811921 - 2²⁶ = 1917703057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984811923) 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 11 ways as a sum of consecutive naturals, for example, 477470 + ... + 481608.

It is an arithmetic number, because the mean of its divisors is an integer number (171292500).

Almost surely, 2^1984811921 is an apocalyptic number.

It is an amenable number.

1984811921 is a deficient number, since it is larger than the sum of its proper divisors (70698079).

1984811921 is an equidigital number, since it uses as much as digits as its factorization.

1984811921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700 (or 4669 counting only the distinct ones).

The product of its digits is 41472, while the sum is 44.

The square root of 1984811921 is about 44551.2280526587. The cubic root of 1984811921 is about 1256.7236457062.

The spelling of 1984811921 in words is "one billion, nine hundred eighty-four million, eight hundred eleven thousand, nine hundred twenty-one".