1983985764 has 24 divisors (see below), whose sum is σ = 4658790528. Its totient is φ = 657115680.

The previous prime is 1983985763. The next prime is 1983985807. The reversal of 1983985764 is 4675893891.

It is a junction number, because it is equal to n+sod(n) for n = 1983985698 and 1983985707.

It is not an unprimeable number, because it can be changed into a prime (1983985763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524652 + ... + 528419.

It is an arithmetic number, because the mean of its divisors is an integer number (194116272).

Almost surely, 2^1983985764 is an apocalyptic number.

It is an amenable number.

1983985764 is an abundant number, since it is smaller than the sum of its proper divisors (2674804764).

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

1983985764 is a wasteful number, since it uses less digits than its factorization.

1983985764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053235 (or 1053233 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The square root of 1983985764 is about 44541.9550985360. The cubic root of 1983985764 is about 1256.5492555263.

The spelling of 1983985764 in words is "one billion, nine hundred eighty-three million, nine hundred eighty-five thousand, seven hundred sixty-four".