1985385716 has 6 divisors (see below), whose sum is σ = 3474425010. Its totient is φ = 992692856.

The previous prime is 1985385707. The next prime is 1985385719. The reversal of 1985385716 is 6175835891.

It can be written as a sum of positive squares in only one way, i.e., 1616361616 + 369024100 = 40204^2 + 19210^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985385719) 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 as a sum of consecutive naturals, namely, 248173211 + ... + 248173218.

It is an arithmetic number, because the mean of its divisors is an integer number (579070835).

Almost surely, 2^1985385716 is an apocalyptic number.

It is an amenable number.

1985385716 is a deficient number, since it is larger than the sum of its proper divisors (1489039294).

1985385716 is a wasteful number, since it uses less digits than its factorization.

1985385716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496346433 (or 496346431 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 53.

The square root of 1985385716 is about 44557.6673087809. The cubic root of 1985385716 is about 1256.8447373253.

The spelling of 1985385716 in words is "one billion, nine hundred eighty-five million, three hundred eighty-five thousand, seven hundred sixteen".