1985385717 has 12 divisors (see below), whose sum is σ = 3277462240. Its totient is φ = 1134506088.

The previous prime is 1985385707. The next prime is 1985385719. The reversal of 1985385717 is 7175835891.

It is a happy number.

1985385717 is a `hidden beast` number, since 1 + 98 + 538 + 5 + 7 + 17 = 666.

It is not a de Polignac number, because 1985385717 - 2¹² = 1985381621 is a prime.

It is a super-3 number, since 3×1985385717³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15756967 + ... + 15757092.

Almost surely, 2^1985385717 is an apocalyptic number.

It is an amenable number.

1985385717 is a deficient number, since it is larger than the sum of its proper divisors (1292076523).

1985385717 is a wasteful number, since it uses less digits than its factorization.

1985385717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31514072 (or 31514069 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 54.

The square root of 1985385717 is about 44557.6673200023. The cubic root of 1985385717 is about 1256.8447375363.

It can be divided in two parts, 19853 and 85717, that added together give a triangular number (105570 = T₄₅₉).

The spelling of 1985385717 in words is "one billion, nine hundred eighty-five million, three hundred eighty-five thousand, seven hundred seventeen".