1983377721 has 16 divisors (see below), whose sum is σ = 2877292544. Its totient is φ = 1207954944.

The previous prime is 1983377701. The next prime is 1983377723. The reversal of 1983377721 is 1277733891.

It is not a de Polignac number, because 1983377721 - 2¹⁷ = 1983246649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1983377723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258361 + ... + 265926.

It is an arithmetic number, because the mean of its divisors is an integer number (179830784).

Almost surely, 2^1983377721 is an apocalyptic number.

It is an amenable number.

1983377721 is a deficient number, since it is larger than the sum of its proper divisors (893914823).

1983377721 is a wasteful number, since it uses less digits than its factorization.

1983377721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524400.

The product of its digits is 444528, while the sum is 48.

The square root of 1983377721 is about 44535.1290668389. The cubic root of 1983377721 is about 1256.4208752293.

The spelling of 1983377721 in words is "one billion, nine hundred eighty-three million, three hundred seventy-seven thousand, seven hundred twenty-one".