1985897859 has 12 divisors (see below), whose sum is σ = 2910462408. Its totient is φ = 1203574240.

The previous prime is 1985897833. The next prime is 1985897899. The reversal of 1985897859 is 9587985891.

It is not a de Polignac number, because 1985897859 - 2¹¹ = 1985895811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1985897793 and 1985897802.

It is not an unprimeable number, because it can be changed into a prime (1985897899) 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, 2735034 + ... + 2735759.

It is an arithmetic number, because the mean of its divisors is an integer number (242538534).

Almost surely, 2^1985897859 is an apocalyptic number.

1985897859 is a deficient number, since it is larger than the sum of its proper divisors (924564549).

1985897859 is a wasteful number, since it uses less digits than its factorization.

1985897859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470818 (or 5470807 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 69.

The square root of 1985897859 is about 44563.4139064771. The cubic root of 1985897859 is about 1256.9527984255.

The spelling of 1985897859 in words is "one billion, nine hundred eighty-five million, eight hundred ninety-seven thousand, eight hundred fifty-nine".